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BODYSIM is available only on Apple iOS devices. There are currently no plans for an Android version.

Can I use BODYSIM with an Android?

BODYSIM is an informational tool and is not designed to diagnose or treat any disease. BODYSIM results are for informational purposes only and are not intended to replace or substitute for a physician’s medical judgment or to be relied upon as a professional opinion. No communication from BODYSIM is intended to be or should be construed as medical advice. Always consult your physician or medical professional for any medical advice, decision or actions regarding your health care, or when changing your workouts, supplements or diet.

Do I need to consult with my physician before using BODYSIM?

Follow your tracker manufacturer’s instructions to sync with Apple Health:

How do I connect/sync my activity tracker?

Setting a realistic goal can be hard for two major reasons. First, it’s difficult to set a goal that’s personalized to all the factors of your physiology and metabolism–what’s right for someone else might not be right for your body. Second, there are many different paths to achieving that realistic goal with different levels of pain. Sure, you could lift for 4 hours a day or go on a 1,000-calorie crash diet to get there fast. But is it worth it for you? How high a price are you willing to pay?

BODYSIM learns your unique metabolism and physiology so you can set goals that are realistic for your body. It allows you to simulate how different diet and exercise plans would allow you to reach your goals, so you can pick and dial in a plan that works for your body and your life.

How do I set goals that are personalized to my workout and nutrition regimen?

BODYSIM implements the most sophisticated energy balance estimation of any app on the market. BODYSIM’s estimate of your energy balance accounts for large and important sources of information and error, including:

Scale weight, including their bias and noise

Scale body fat, including their bias and noise

Fitness trackers, including their bias and noise

Because BODYSIM implements a detailed scientific model of human metabolism and physiology, it can triangulate the truth about your basal metabolic rate (BMR) and energy balance by considering how all of these noisy observations must come together and evolve in your body through time. Building muscle requires a certain amount of protein, extra energy and resistance training.

How is my energy balance calculated?

The BODYSIM subscription service is uniquely powered by a mathematical model of human metabolism and physiology, combined with sensor fusion, to help you achieve your body composition goals. This subscription includes:

A comprehensive starter package that includes:

Interactive composition goal and diet and exercise plan builder

Continuous progress monitoring and estimation of your metabolism, physiology and sensor biases

Sophisticated body composition forecasting and what-if diet and exercise scenario planning toward your goal

Monthly at-home blood testing of select diet and exercise biomarkers

The BODYSIM system costs $5,000 per year.

How much does BODYSIM cost, and what does an annual subscription include?

To learn more about how BODYSIM can help you find your peak potential, contact us.

I have a question that’s not answered here. Who can I contact?

Strive for food logging accuracy by following these strategies:

 To achieve the highest accuracy, always include the big 4: calories, protein, fat and carbs.

 You don’t need to log items with little nutritional value, like water, spices and supplements. Always log high-calorie items, like oil, butter and sugar, no matter the amount.

. Use your included smart-scale to accurately log meals by weight. Logging by volume isn’t ideal, but it’s better than guessing; you can also select a close substitute/proxy food.

 Unlike other apps, BODYSIM “groups” can be used like repeated meals or recipes containing other foods and 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.

 Especially at smaller restaurants, you’ll have to make two big guesses: portions in volume units and components of recipes. Use our guide for portions and remember to include butter, nuts, cheese and sugary ingredients.

 Many chain restaurants, grocery stores and food manufacturers put nutritional info on their website.

I’ve never tracked my macros before. What do I need to know?

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Is there a free version of BODYSIM?

For BODYSIM to work as designed, you need to feed the model with specific measurements and data points. To get the full BODYSIM experience, you will need to:

Describe your frame with initial measurements, like height and wrist circumference.

Get a DEXA scan at a DEXAFit location to baseline your starting muscle, bone and fat composition.

Complete our baseline at-home blood test to ensure select hormones, diet markers and vitamins/minerals aren’t holding you back.

Track your daily macros in the BODYSIM app’s food journal.

Weigh yourself most days on the provided WiFi body composition scale.

Let the BODYSIM team help you set a body composition goal, such as to lose 5 pounds of fat and gain 10 pounds of muscle over 4 months.

Let us help you define a diet and exercise plan describing your daily calories, macros, resistance training and cardio.

What do I need to do to reach my peak physical potential through the BODYSIM system?

BODYSIM is constantly learning where you are and what must be true about your unique metabolism, physiology and habits to have gotten you here. If you don’t hit your goals on schedule, BODYSIM learns what portion of that gap was related to your diet or exercise gap to plan and what portion represents a new understanding of your potential metabolism. BODYSIM then uses this understanding to help you get a new, more accurate plan tailored to you.

What happens if I don’t hit my goals?

We recommend that you track your macros every day. With a stretch goal in mind, it can be difficult to stay on plan without a comprehensive support system like our app’s food journal. However, sometimes it’s just not practical. When you cannot complete a log, we encourage you to remember these tips:

Don’t skip logging on exceptional or outlier days

. BODYSIM will fill in your skipped days with your typical habits. If you tend to not log on days that are much higher or lower in calories, protein, fat or carbs than usual, you will create a bias BODYSIM cannot remove. Always log exceptional days unless they are very infrequent, like a holiday potluck.

 BODYSIM will assume that your partial day was actually a full day and you ate very little. If you cannot log a full day, delete all foods from that day entirely.

 It’s OK to not log a typical day here and there, but avoid runs of successive days without logging. If you have a weeklong work trip or a vacation, try to log at least a few of those days.

What happens if I forget to track my macros for a day (or more than one day)?

As a member of the BODYSIM community and part of your subscription, we provide you with all the tools and guidance you need to be successful. (You must provide the drive to reach your goals, though.) Your subscription includes prepaid DEXA scans at the DEXAFit franchise location closest to you, a Withings body composition scale, a kitchen smart-scale, at-home blood tests mailed to your home and more.

A fitness tracker is strongly recommended, and BODYSIM supports all trackers that integrate with Apple Health.

What if I don’t have access to the above requirements?

BODYSIM is an app-based system that learns your unique metabolism and physiology, and continues to reveal your body composition by fusing a variety of data and sensors using a scientific model of metabolism and hypertrophy. The BODYSIM system covers every major element that supports your physical health and progress.

What is BODYSIM?

Your body composition—and improving it—is at the heart of BODYSIM. When we refer to body composition, we mean the percentage of muscle, fat and bone that makes up your body weight.

What makes up a person’s body composition?

Our blood panel includes unique "off-label" measures of your hormonal sufficiency, key vitamin and mineral sufficiency, a marker of sufficient resistance training and supplementation, markers for sufficient/excess macro consumption, and liver and kidney controls; along with our custom fitness focused reference ranges and literature links {Free Testosterone, Total Testosterone, Albumin, SHBG, E2, Free T3, Creatinine, Cystatin C, AST, GGT, 25-(OH) Vitamin D, Ferritin, Homocysteine, HOMO-IR, Insulin, Glucose, BUN, A1C, Total Cholesterol}

What markers are included in the blood test panel?

Some future BODYSIM features, such as AR portion size estimation, may require rear-facing LiDAR, such as those currently only available on the Pro and Pro Max models of iPhone 12 and newer.

What versions of iOS does BODYSIM support?

A fitness tracker is useful but not required to use BODYSIM. If your workouts are largely consistent, BODYSIM can estimate your exercise and account for it without a fitness tracker at all.

For more accuracy (or if your exercise is more varied), BODYSIM integrates with any fitness tracker that supports Apple Health. This includes Apple Watch, Garmin watches (Venu, Forerunner, Instinct, Epix and Fenix) and trackers (including Vivosmart), Whoop, Oura and Withings watches.

Some BODYSIM users have had difficulty getting Oura rings to track workout heart rates, presumably due to the lack of half ring sizes. We do not recommend purchasing a new Oura ring for BODYSIM unless you already know it is capable of tracking workout heart rates on you. If your Oura ring does track your workout heart rate, it will work with BODYSIM.

BODYSIM does NOT support Fitbit or Google Pixel trackers or watches, as these devices do not integrate with Apple Health.

Which smartwatches and activity trackers does BODYSIM integrate with?

BODYSIM translates the best academic research into software and a system you can use to achieve your goals. The heart of that software is a scientific simulation model of human metabolism and physiology. Building this model was no easy task—we believe it to be the first time all the pieces of the diet, nutrition, exercise, physiology and metabolism puzzle have been integrated into a cohesive whole.

The creators of BODYSIM have been translating academic research into software for decades. Our team of biologists, mathematicians and computer scientists are experts in the kind of translational research it takes to collect, piece together, synthesize and extend academic research in complex domains. We’ve successfully translated models into software for the Human Genome, cancer genetics, molecular plant breeding, high-frequency trading, consumer buying behavior, battery electrochemistry and more.

Who created BODYSIM, and what are their qualifications?

An excellent starting benchmark is the foundation to monitoring progress. DEXA scans are the gold standard method to assess body composition by partitioning muscle, bone and fat mass.

Other methods do not work. Even the best “calculators” (we call them anthropometric estimations) can be hugely off for some people—enough to imply a difference in estimated BMR greater than the entire caloric deficit or surplus necessary to reach their goal. Machine learning methods based solely on vision, such as those that take 3D scans of your body in an office, on your phone or even in a special suit, claim accuracy on par with DEXA but do not in fact deliver.

We have seen body fat percentage errors of 50%(!) versus DEXA from even the leading machine learning vision-based app. BIA or body composition scales, home versions and more sophisticated scales you might find at the gym or your doctor’s office similarly may report correct trends but are notoriously inaccurate; we’ve seen consistent, repeated body fat percentage errors of 75%(!!) versus DEXA even on the best home octopolar, multifrequency BIA scale.

Frequently Asked Questions

Can I use BODYSIM with an Android?

Do I need to consult with my physician before using BODYSIM?

How do I connect/sync my activity tracker?

How do I set goals that are personalized to my workout and nutrition regimen?

How is my energy balance calculated?

How much does BODYSIM cost, and what does an annual subscription include?

I have a question that’s not answered here. Who can I contact?

I’ve never tracked my macros before. What do I need to know?

Is there a free version of BODYSIM?

What do I need to do to reach my peak physical potential through the BODYSIM system?

What happens if I don’t hit my goals?

What happens if I forget to track my macros for a day (or more than one day)?

Is there a free version of BODYSIM?

What do I need to do to reach my peak physical potential through the BODYSIM system?

What happens if I don’t hit my goals?

What happens if I forget to track my macros for a day (or more than one day)?

What if I don’t have access to the above requirements?

What is BODYSIM?

What makes up a person’s body composition?

What markers are included in the blood test panel?

What versions of iOS does BODYSIM support?

Which smartwatches and activity trackers does BODYSIM integrate with?

Who created BODYSIM, and what are their qualifications?

Why do I need to get a DEXA scan to use BODYSIM?