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A window appears to set permissions for Apple Health.  Turn on all.

Click Continue when you receive a message regarding amazoncognito.com.  

You will then receive a sign in with Apple screen.  Be sure to select Share My Email. Click Continue.

The first time you log in you will receive an "Unable to verify your account message.  

.  We will enable your account and notify you to log in again to set up your profile in the app. 

You will receive a screen to enter your profile information.  Enter all the information on this screen. The measurements on this screen are IMPORTANT. Take the time to measure your waist, wrist and ankle circumferences.

 Enter a Walmart Store ID.  If you don’t know the one closest to you, use the store finder.  The Walmart id allows you to set up home deliveries of recipe ingredients that you choose.  It is not required for the other features in the app. You may need to press and hold to enable the text box to present a keyboard for entering the id. 

Installation Instructions

You’ll be prompted to setup your profile on first install.

Your “anthropometrics” are very important to get sub-inch accuracy for. Use a piece of yarn and ruler to measure and enter your Waist, Wrist and Ankle Circumference.

Your other answers will help determine a pre-model TDEE and body fat percentage that will power the pre-model goal setter and macro recommender.

In goal setup, the rate of change sliders are your preference. More aggressive goals will yield more “painful” macro targets.  In macro setup, you’ll be asked for preferences. Think of these as the guidance of how to allocate any extra calories that are remaining after your minimum protein, carbohydrate and fat targets are met. These do NOT affect outcomes. If your goals are extreme, carbs vs fat may not have anything left over to matter.

Profile Set Up With Initial Goals and Targets Pre-Model Calibration

The resistance training workout on-boarding flow sets and marks pre-selected splits as favorites to help new users get started. This is just to get you started. Later you can make and mark custom workouts as favorites as well.  

Set Up Resistance Training Preference

In order to get the most comprehensive model possible, we pull a lot of data from Apple Health. You can track food in another app if you prefer and BODYSIM will pull that data from Apple Health. BODYSIM will also pull all motion tracking data to use as part of your exercise calories. However, it is important to pay attention to what is coming in from Apple Health, and delete it if necessary.

If you think you might have a stray data source (one way this can happen if you use My Fitness Pal to look up macros of something you’ve eaten before or something missing from the BODYSIM database) BODYSIM will pull those macros across and you’ll either get double counting or strange partial days.

Ensure you enable any fitness tracker you want BODYSIM to use to send data to Apple Health. If you use a Garmin, you can follow 

If your data is causing issues with the model, the BODYSIM team will likely notify you. However, it’s nonetheless important to stay on top of what sources are syncing to Apple Health to avoid future issues. You can identify sources syncing with Apple Health through the “Sharing” page, navigating to “Apps” Here’s a detailed overview of how to deal with your rogue data:

What to do if you are Notified of Bad Nutrition Data

You will need to remove this data to get a good model run.  The general steps you will need to follow are important to follow in exact order so that the removed data does not re-sync to Apple Health.  

Locate the source app. Open Apple Health and locate the source app. You may know which app is based on the dates but you can go to Sharing, scroll down to Apps and expand to identify the list of apps. 

Likely culprits will be previously used food trackers like MyFitnessPal, LifeSum, Cronometer, LoseIT, etc. Open that app(s) scroll down to locate Dietary Energy and untoggle sharing. Alternatively you can go to Apple Health,  Sharing and scroll down to Apps and expand the list and untoggle sharing for the app that is providing bad data.

⚠️ It's important to disconnect the source before cleaning up the data to prevent the app from recontaminating your data again. ⚠️

Next, remove the bad data. You may be able to find it by clicking Browse in Apple Health and search for "Nutrition" and then "Dietary Energy", scroll to the bottom of that screen and select "Show All Data".  Look for the dates provided and remove the data on those days.  Note that the data may be problematic because it represents a partial day to BODYSIM. This may not have been a problem when merely tracking data but becomes a problem when used for modeling your metabolism. 

If this is an app that you are still using, you may also want to fix the data in the app as well but please DO NOT set it up to share this data with Apple Health. 

See screenshots for identifying which apps are syncing to Apple Health and deleting their data:

If you don’t plan on tracking full days using the selected App, make sure you uncheck all boxes to make sure new data won’t be synced in the future:

You can review your daily energy expenditure in your Energy Balance BODYSIM card and in the Data Feeds BODYSIM card. Check out how to find this information

If you use a fitness app (e.g. WHOOP) and DON’T want the data to sync to BODYSIM through Apple Health, the process will be the same. Navigate to that App through the sharing screen on Apple Health, delete all data, and turn off all data points. This way you can continue using that App for informational purposes without any data conflicts in BODYSIM. 

You can also choose to keep your cardio apps syncing to BODYSIM, which can be helpful to get a better picture of energy expenditure from activities, along with a sense of how accurate your Strava or watch tracker is at calculating calories burned from an exercise session. 

Use the same function to either enable, disable, or select what you want each app to share into Apple Health, and thus BODYSIM.

Managing Data Integrations through Apple Health

Check Apple Health Connection from Garmin Connect App

If you have a Garmin device, but aren't sure data is flowing into Apple Health and BODYSIM, you can check in your Garmin Connect and Apple Health apps. In Connect, select Connected Apps. From this screen, you should be able to see Apple Health. Click on Apple Health, and ensure that you see the screen "You are connected to Apple Health". 

Check Data Sync Status from Garmin Connect to Apple Health

Start by opening the Apple Health app. Select the Active Energy screen. From there, you can see "Data Sources & Access".

When you enter the Data Sources view, you should see a list of apps allowed to read from Apple Health, and a list of apps allowed to write to Apple Health when you scroll down. If you drill into the Connect app, you'll see all calories recorded from Connect into Apple Health. If you are using a Garmin device to log exercise, there should be calories there. 

While in this screen, You can also take the time to ensure BODYSIM is ON. 

Adding Garmin Devices to BODYSIM via Apple Health

There is a high accuracy/high pain to low accuracy/low pain continuum of logging strategies. 

First, learn what matters–you might be surprised how caloric some items are. Then, lean as high accuracy as you can stand, but don’t worry about going crazy.

You don’t need to log items with little nutrition. Don’t bother logging water, spices, supplements, etc. Always log high calorie items like oil, butter, sugar, etc. 

Prefer Weights, but Volumes are Better than Guessing 

Prefer logging by weight using your kitchen scale as highest accuracy. Try grams, use a “weigh boat,” and use “tare tricks” to add and subtract. 

Highest accuracy is use the label scanner/manual entry of a label. Always include the big 4 (calories, protein, fat, carbs). You can also carefully pick a very close substitute/proxy. 

Unlike other apps, our “groups” can be used like repeated meals or recipes containing other foods, and they can be nested–a supper group of a steak, a slice of a cornbread recipe group, and a tablespoon of a pan sauce recipe group.  

At restaurants you have to make 2 big guesses: (1) portions in volume units, and (2) components of recipes. Use the “handy guide” for portions, and “always remember to add the butter” (and nuts, cheese, sugary items) to recipes. Chain restaurants and grocery stores have facts on file/web! 

For estimating portions of ingredients like cheese or butter at the table at a restaurant, you can use a number of heuristics. Here's a simple guide from the University of MN:

Eat again - Long press on a food that you have already logged in your food journal brings up the “Eat Again” option

Search - opening search before you add a search term - brings up foods that you have recently eaten in top picks, then previously logged foods containing your search term will show up as "Favorites" once you type something in.

Suggest -  looks at your macros remaining for the day and suggests foods from amongst foods you’ve logged and suggests foods that might satisfy your macros for the day. 

You don’t want to have to look up bread, peanut butter and jelly every time you log your PBJ.  We make it easy for you to create compound foods and recipes.

Notice that within the food- not only can you adjust the portion,  you can scan, search or custom add additional foods to create a compound food. Naming the food makes it searchable.  

If it's something that you often make many variations of you might also choose to create a recipe to save in your recipe box.  You can also start a food from the recipe box and add it to your journal later.  This is handy if you are planning meals ahead of time or just want to capture a good recipe when you see it.   

If you start from the recipe box to find your food, long press brings up the menu to add to the Food Journal. 

Getting Started Logging Food

After you create your BODYSIM profile, you will want to take your first in app 3D body scan.  You will need to register the scanning software to get started. Go to the BODYSIM tab, scroll down to Resistance Training and open the drill down. 

The information presented will come over from the data you entered in your profile. Select 

Click the respective links to review the policies for Well Principled (BODYSIM) and Prism, the owner of the 3D scanning capability. If you agree, 

In-App 3D Scan Registration

Here are some tips on a successful 3D scan:

✅ Always wear similar form-fitting clothing

✅ If you have long hair make sure it’s up and your neck is visible

✅ Place the camera at about waist (table) height

✅ Scanning with a plain background is better

✅ Make sure to have your body fully visible while spinning

✅ Make sure that your body fills in as much of the camera screen as possible

✅ Stand in an A-frame position while spinning

✅ Make fists with your hands while spinning

✅ Make sure the scanning area is free of obstructions like furniture

❌ Don’t move out of the camera frame while spinning. Stay aligned with the center of the frame.

❌ Don’t scan in front of a mirror - it will confuse the camera

❌ Don’t stand with furniture obstructing the view from the camera

❌ Don’t stand too far away from the camera

❌ Don’t stand in front of furniture or cluttered backgrounds

❌ Don’t scan in overexposed lighting

❌ Don’t scan in low or dark lighting

❌ Make sure your front camera lens is clean and not producing blurry photos

Find in Resistance Training drill down, far bottom

Most Important: Position your iPhone so that it is 

Follow the audio directions to get the appropriate distance away, get into the pose and spin as directed

A 3D avatar with your measurements will be generated

BODYSIM In-App 3D Scan

You should use your Withings Body Scan for weigh-in's because it is the most accurate we’ve found for daily measurements. Your DEXA scan is the gold standard for lean and fat mass, and your Withings scale contributes 

 values to capture changes.  After extensive technical research, we’ve selected this particular scale due to its combination of accuracy-increasing technologies (octapolar, three-frequency, multi-weight sensor) and WiFi connectivity. Even so, you may notice differences between measurements from your Withings scale and your DEXA scan. Don't worry, BODYSIM triangulates the truth from all of your data. More background on this scale can be found in our BODYSIM blog post entitled 

Not All Body Composition Scales Are Alike.

Withings Body Scan Integration with BODYSIM

Why Withings Body Scan BIA Scale?

When you receive the Withings Body Scan scale, you will need to take some time to install, set up and integrate the scale.

Once you get your Withings Body Scan set up, you need to make sure your scale is connected to WiFi and you've used the "Share" tab to ensure it's connected to Apple Health. This will feed your data from your scale, to the Withings app, to Apple Health, which BODYSIM uses for your daily weight and body composition values. 

If your scale is correctly set up, on WiFi, and syncing with Apple Health, you'll see your "weigh ins" updated on your Data Feeds card in the BODYSIM tab of of app. You can see in this shot below, this user had an issue with their scale not connecting to WiFi, so they needed to troubleshoot. 

It's important to follow the manufacturer's guidance on how to stand on the scale as well as placing it on a level surface. Measuring is most accurate when: 

you’re “towel dry” out of the shower

verify correct user and lift foot to switch users if necessary

you’re fully hydrated but have not consumed a large amount of water in the last half hour

standing with your heels on the second stripe from the bottom/toes to the sides of the screen

ensuring your arms don’t touch your sides and your thighs are spaced apart or separated by undergarments

and leaning so that you do not see any of the 4 triangle tilt sensors around the display. 

We recommend measuring at approximately the same time of day each day, and if possible, either consistently before or consistently after your major bowel movement.

You will occasionally need to update your Withings app as well. With the app open drag the homescreen down to refresh. 

Here's some details on how to make sure your scale is syncing to Apple Health

Withings Daily Weigh In Best Practices

Your BODYSIM subscription includes quarterly scans covered by us. Ideally, you should schedule the first one for 7-14 days after you have started logging food and weigh-ins. The best scenario is to have your scan after you have logged several days in the app completed.

Upon subscription we will do the research to locate the best provider(s) in your area.  Not all scans are created equal and it's important that you get a good provider for this important data so we’ll tackle the research to find one on your behalf.

You should book your 2nd DEXA 3 months out from the first. We’d highly recommend you get that on the books early so you don’t have any scheduling difficulties in the future.

The provider will send you instructions but we’ve included some tips below to get the most of your experience.

Look for an email from a Well Principled team member personally reaching out to you to confirm a suitable location

Limit activity before your scan (no exercise for at least 2hrs)

Workout or casual clothes with no metal are best for your scan

You will be asked to empty your pockets and remove any significant amounts of metal (watch, belt, glasses, jewelry, etc.) 

Small buttons or zippers that cannot be removed from clothing are fine

You will also need to remove your shoes (please wear socks)

The values needed in BODYSIM are Total Fat Mass, Total Lean Mass and Bone Mass in lbs. 

The needed values can be taken directly from 

 but you will need to increase the number of decimal places in the app to get the appropriate precision needed for BODYSIM.  Below are the screens you need to use to get the values from the app. 

 You will need to convert Fat Mass from grams to lbs.  Lean Mass has to be calculated from Lean Mass + BMC. BMC is bone mineral content.  Locate Total BMC(g) and Lean + BMC (g).  Convert both values from grams to lbs and subtract Total BMC from Lean + BMC.

(which is bone mineral content), shown in grams - divide by 453.6 to convert to lbs to enter into the app. 

You will also need total fat and total lean,  available from 

 (g) by 453.6 to convert to lbs.  Divide 

BODYSIM - DEXA Scans

You will receive a kit every month as long you continue to submit them to the lab. You will want to execute the first one in the first 7-10 days of using the App. Wait a month between subsequent kits. The lab instructions come with the kit and they offer real-time assistance through the link they text you to opt into live video chat.  

You should have a separate email from BODYSIM Lab with the tracking id.

The testing is simple but we’ve collected some tips and tricks to make it as easy as possible:

Sample soon after waking (or diurnal hormones will be off) after a glass of water but BEFORE EATING, DRINKING, or TAKING PILLS (glucose and insulin will be off) and BEFORE EXERCISING. Set your kit out the night before as a reminder, and along with a pen/sharpie (smear proof ink), with a fine to ultra-fine tip.

Drink a full glass of water when you wake up. Sampling is more difficult if you’re dehydrated.

Set up your “testing station” like the cooking concept  “mise en place”. Take the time to set up, write your name/dates on the card(s) without touching the testing strip … open the lancet, open the bandaid and remove one side, open the alcohol wipe, open the gauze pad…The first time is the most frustrating but with practice it’s under 5 mins

Scan the barcode (use the camera app) and register on your phone.  Use the same email that you used to install the BODYSIM app.

Plan to poke your non-dominant ring finger. Warm it up with hot water or the BODYSIM heat pack first. Use blue/deep lancets first time, but yellow/shallow if you have thin skin. Poke OFF-center to your finger pad, on the pinky-side (or the blood path is silly)

Bunch your to-be-poked finger pad up using your same-hand thumb–easier to pop a taught balloon right? Getting a good poke is the #1 determinate of success. Hydration + heat + milking (below) for flow is #2.    

After you alcohol swab and poke as above, don’t forget to discard the first drop on the gauze (it’s contaminated)    

Using your poked-hand thumb and other hand’s pointer finger and thumb, “milk” your finger down from your hand to the tip like a cow udder to coax each drop out. You can also try milking from the far side of your finger pad towards the puncture. Deposit 4 big drops per box (2 boxes male, 3 female)   

Allow your card to completely dry for a couple hours. Seal your cards up in the foil pouch(s) (don’t remove the contents), seal the foil pouch in the mailer, and get it into the mail (USPS) within a day or two

In Home Blood Testing

What to do when you receive your Tasso Microtainer Blood Sample Kits

These instructions are specific to the New York  participants. You should have a separate email with the tracking ID.  Note: Samples should be returned via FEDEX.  Important! Sample and ship Mon-Thu and avoid a Fri-Sun drop off / pick up to  preserve the sample integrity.

The Tasso microtainer collection system takes about 15 minutes to set up and administer.  You need to be sure that you allocate that much time. You will also want to be sure that you can arrange ​FEDEX​ pickup or drop off as the case may be for you, for the sample on the day it’s collected.  You may want to sit aside a morning on the weekend to sample if it's less stressful to sample then.

Sample soon after waking (or diurnal hormones will be off) after a glass of water but BEFORE EATING/DRINKING/PILLS (or glucose and insulin will be off) and BEFORE EXERCISING. Set your kit out the night before as a reminder, along with a fine tip smear-proof pen/sharpie.

Register your kit!  Use the same email that you used to install the BODYSIM app.

Be sure to read the instructions. As part of the registration process, watch the video on sample collection. 

Apply the heat pack or a hot washcloth to the application area long enough to completely warm that area.

Set up your “testing station” like the cooking concept  “mise en place”. Take the time to set up, write your name/dates on the return bag.  You’ll be returning the tube that attaches to the Tasso device so be sure to fill out the D.O.B. on the tube.  Lay out gauze and band-aids. Remove the cap from the tube and attach it to the Tasso device.

Remove protective packaging, place the Tasso on your arm and press the button. You may feel a prick but less so than getting a shot,  Wait, blood might not appear for a minute or two. Monitor the collection in the vial. A sufficient sample is collected once the blood reaches the top line. This can take up to 5 minutes. Remove the Tasso from the collection when the sample is complete. Remove the vial from the Tasso collector.

Snap on the cap and invert the tube 10 times and flick as shown in the video to mix the sample with the gel inside of the tube. This tube will go into the sample bag and the sample bag will go into the return package. Be sure to ship off via FEDEX the same day!

If the heat pack doesn't work, substitute a hot washcloth for two minutes if needed

When you push the button to apply, you may barely feel a prick and wonder if blood is going to come out. Wait 2 minutes, and if blood is not entering the tube, remove the device.  Contact us and we’ll request a replacement.

Watch the video and flick the vial as demonstrated to ensure that the sample mixes.

The package came with extra lancets; discard them.  If the Tasso doesn’t work after two minutes of application, it doesn’t work. Report the issue and we’ll request a new kit on your behalf.

In Home Blood Testing - NY

What Does BODYSIM Include? The BODYSIM package: 

Subscription access to the BODYSIM app which includes Fitness forecasting via the BODYSIM Digital Twin, Recommendations on consumption and exercise expenditure, Rx Meal Planning and food logging, Rx Workouts and resistance training tracking, 3D body scans and other biometric tracking.

Quarterly DEXA scans at a DEXAFit location; our team will reach out to you on locations and credits. 

Monthly At-home blood tests; you will receive your kits at home.  You will receive notification in the app on when to administer the test.  We will share detailed instructions and help is available throughout the whole process. 

Withings Body Scan BIA scale; your Withings scale will ship directly to your home from Withings. 

Welcome to BODYSIM box, including an Escali kitchen food scale, a BODYSIM t-shirt, a BODYSIM blender bottle, and a BODYSIM heat pack to use with your at home blood tests.

Download and install the BODYSIM app from the Apple Store.

  You will log in twice to get started, once so that our app receives your email and a second time after we enable your account. If you need help, please contact support@bodysim.com.

Once you have access to BODYSIM, the app will guide you to create or enter:

your food macro settings that will be used during the 7-14 day training period. BODYSIM will recommend short term initial macro targets in line with your goals and the metabolism of people with similar measurements and habits. This is to provide some guidance during the training period after which, you will receive your true macro targets when BODYSIM has learned your unique metabolism.

The information above will be stored in your profile and NOTE that you need to return to your profile after your DEXA scan to add your lean mass, fat mass, bone mass and body weight per the DEXA scan values. 

You will also be guided to take your first 3D body scan from the app. Note that you will return to your profile after your DEXA scan to update your lean mass, fat mass, bone mass and body weight per the scan values. 

BODYSIM will recommend initial macro targets in line with your goals and the metabolism of people with similar measurements and habits. This is to provide some guidance w Later, you’ll update your macro targets once BODYSIM has learned your unique metabolism.

day of meals. Food logging is the cornerstone data that powers your digital twin

Ensure your fitness tracker(s) are connected to Apple Health and flowing into BODYSIM 

If you’ve logged and weighed-in in other apps before, r

emove any partial days or incorrect data from Apple Health

Schedule your DEXA scan  and take your first blood test 7-14 days after you have started logging food and weigh-ins (Look for your DEXA Scan email)

BODYSIM learns your metabolic and physiologic digital twin using a variety of data, including your energy consumption and energy expenditure. It is much more sophisticated than the old “calories in, calories out” method and so requires a bit of care. The following best practices will cultivate good habits for logging, weighing and tracking exercise AND will ensure you’re creating good data to train your model. You can then use BODYSIM to inquire or forecast outcomes on changes you are considering. 

BODYSIM uses logged food consumed, exercise and your body biometrics (weight, lean mass, fat mass) along with other data you may already be collecting through various activity trackers (Garmin, iPhone, Apple Watch, etc)  to construct your Digital Twin. 

The Digital Twin triangulates the true signal from all your data sources and learns your metabolism’s response to food and exercise and simulates what will happen if you stay on your plan or trend if you have been operating differently than planned. 

Set everything up in Apple Health.  After you get your BODYSIM app and your Withings scale, you will need to make sure all apps have access to Apple Health, this includes: BODYSIM, Withings, and fitness trackers. Note: If you have historical weight or food logging data, you should remove access to Apple Health for those apps and delete the old data from Apple Health. We mention this because this is a common snag.  

Daily food logging in BODYSIM and daily weigh ins using the Withings Body Scan. Occasional missed days are not a problem. Remember your data is your contribution to constructing your Digital Twin. You should weigh-in and log essentially all food (with macros, not just calories), at least 6 days a week, with no gaps of two or more consecutive days as a best practice.  While you want to avoid skipping days, when logging food your Digital Twin can handle missing days better than incomplete days.

You will need to log for 7-14 days for the Digital Twin to collect enough data to generate a good Fitness Forecast (aka simulation.)  This Fitness Fore is the basis for goal setting and recommendations you will receive in the app. 

Weigh your food using the Escali scale provided.  It gets faster with practice and we will send some tips and tricks, including what to do when eating out. 

Expect some differences between your DEXA scan and Withings for lean mass and fat mass.  We use the DEXA scan as the benchmark and the daily signal from Withings to determine daily change.   

Our BODYSIM recipes used in Rx Meal Planning have an integrated shopping cart that allows you to quickly order home delivery using Wal-Mart+.  The recipes are intended to take the work out of your meal planning and food logging.  You are not required to use them or to use Wal-Mart+,  it just makes meal planning, food logging (and shopping for that matter) easier.  

Our BODYSIM Rx Workouts are another convenience feature. Resistance training is critical to muscle gain and while an integral part of the program, totally adaptable to your needs and equipment.  When you start it will take some time to watch the demonstration videos but if you have ever consumed workout videos from the internet it's not a bigger time investment than that. You are not required to use the Rx Workouts, you can build a custom plan of your own using our extensive library of exercises.  

All cardio workouts tracked in other apps and devices will come into BODYSIM automatically if you complete the Apple Health set up.

When you started BODYSIM, initial target macros were created based on the data you provided. Once you complete your DEXA and enter those results, a new set of macros will be recommended in the Body → Lean/Fat Mass Goal Progress → Nutrition Targets. You can accept or adjust those. The "Protein Preference" slider allocates calories to protein, then you can choose whether to add extra calories to carbs or fat. Essentially, the app is calculating your energy deficit or surplus, then you can influence how much extra you put into which macros:

The exercise calories should be an average over the course of the week. For example, if I typically burn 400-600 calories doing cardio four days/week, 350 calories doing resistance training twice a week, with one rest day, I'll keep my average around 400 calories for exercise. It's easy to accidentally overestimate exercise calories with rest days, so the average should always be a little lower than any actual exercise session. 

Log your food intake daily using BODYSIM. While occasional missed days are not a problem, try to log essentially all food 6 days a week, and try to avoid gaps of two or more consecutive days. Never log partial days–either go back later to fill them or completely delete all meals on that day.

Collecting quality data takes some time, so in the first few weeks, pay more attention to fine tuning your habits as well as monitoring your energy balance (Body → Energy Balance → Typical Energy Expenditure) and macros. While you are logging, tracking and physically training–you are also training your model. If your energy expenditure looks low, you might be accidentally under logging calories. Vice versa, if your energy expenditure looks unusually high, you could have accidentally over logged. We had an example of accidentally logging a whole jar of peanut butter, and another of repeatedly logging only 1g of olive oil rather than 1tsp. 

We need to make sure BODYSIM gets the right data to feed into the model. We're currently using Apple Health as a hub, so the correct sources need to be syncing to Apple Health, and any defunct sources should be disabled. Here's the overview:

Weigh-in daily using the Withings Body Scan. Ensure your Withings Scale is writing to Apple Health. Go to Apple Health → Data Access and Devices → Withings → Turn On All

Connect BODYSIM to Apple Health. Go to Apple Health → BODYSIM → Turn On All

Make sure your other devices, like activity and sleep trackers, are writing to Apple Health

When you get your DEXA scan, add that information to BODYSIM by selecting More → DEXA Scans

At the end of each week, review your past “Energy Balance Last 7 Days” in Body → Energy Balance to identify potential issues. Unusually high or low values could come from missed days of food logging or issues with activity tracking in Apple Health.

Watch out for incorrect scale weights coming from other devices or apps such as Power Sync. Every day you skip a weigh in–Power Sync could fill in the gap with old data.