From doctor’s offices to social gatherings, body weight is usually the only number people focus on when discussing healthy weight. But the truth is, the number on the scale tells us very little about what is actually happening inside the body. Two people can weigh exactly the same weight and be the same height and age, yet have very different levels of muscle mass, body fat, metabolic health, strength, mobility, and disease risk. This is why many healthcare and wellness professionals are now placing greater emphasis on body composition rather than weight alone.
Body composition helps us better understand what the body (and its weight) is made of. This includes lean muscle mass, body fat percentage, visceral fat, and hydration levels. These measurements provide far more meaningful insight into overall health, healthy aging, metabolic function, and quality of life. In a fitness and wellness setting, these measures also act as important markers of program success. For instance, if someone is in a weight management program and losing weight but their body composition shows the majority of that weight loss is coming from muscle mass while visceral fat isn’t moving, we know the intervention is not working the way it should and needs to change. Maintaining healthy body composition becomes arguably more important as we age, since we need to consider preserving strength, independence, energy, and long-term health into our fitness and wellness goals.
What Is Body Composition?
Body composition refers to the proportion of fat, muscle, bone, and water in the body. Body composition can be measured in several different ways, with methods like hydrostatic weighing being the most accurate but least accessible (typically only in research facilities) and others like bioelectrical impedance scales being slightly less accurate but still very good estimates and very accessible (typically in fitness and wellness centers). Unlike standard scales, body composition scales show total weight and also differentiate between:
– Lean body mass (muscle, bone, organs, and water)
– Body fat mass
– Visceral fat (fat stored around internal organs)
These differences matter because not all weight carries the same health implications. For example, losing muscle while maintaining the same body weight may negatively impact metabolism, mobility, balance, and overall function. Conversely, gaining lean muscle while reducing body fat can significantly improve health, even if the total scale changes very little. This is one of many reasons why body composition is a valuable tool, as sometimes a total weight may not show positive changes happening inside the body and that can be frustrating for someone putting in work and effort to see change.
Why Lean Muscle and Body Composition Matters for Aging
One of the most important body composition measurements for adults over 65 is lean muscle mass. As we age, we naturally lose muscle tissue at a rate of approximately 3% per decade after age 30 and if unchecked can lead to a condition of muscle wasting called sarcopenia. Sarcopenia can lead to reduced strength, lower metabolic rate, increased fall risk, loss of independence and difficulty performing daily activities.
The positive side of all this is that muscle loss does not have to be so rapid and can even be slightly reversed with intentional fitness interventions and appropriate nutrition. Common strategies include:
– Incorporate resistance or strength training at least 2–3 times per week
– Prioritize adequate protein intake throughout the day
– Stay physically active every day
– Include balance and functional movement exercises into weekly or even daily routine
– Support recovery with quality sleep and hydration
These interventions can be implemented much more successfully if muscle loss is caught early by regular body composition screening.
Why Body Fat Percentage Matter for Overall Health
Body fat is essential for normal body function, but excess body fat, especially when stored as visceral fat and particularly when combined with low muscle mass, increases risk for metabolic disease, cardiovascular disease, and chronic inflammation.
Body fat percentage provides more meaningful information than body weight or Body Mass Index (BMI) alone because it reflects how much of the body consists of fat tissue relative to lean tissue. Digging even deeper, there are different forms of fat and unlike subcutaneous fat, which sits just beneath the skin, visceral fat surrounds internal organs deep within the abdominal cavity.
Higher body fat percentages as well as elevated visceral fat stores are associated with insulin resistance, increases inflammation, elevated cardiovascular risk, reduced mobility and fatigue. Common strategies to improve body fat percentage and visceral fat stores include:
– Regular aerobic activity such as walking, cycling, or swimming
– Strength training at least 2 days per week to support metabolic function
– Prioritizing sleep quality
– Managing chronic stress levels
– Limiting highly processed foods and excess added sugars
– Supporting healthy blood sugar balance
While the risk of excessive fat stores is important to evaluate, excessively LOW body fat can also be problematic, particularly in older adults, where maintaining adequate nutritional reserves is important. All of this information combines into great reasons to assess fat composition. The goal is not to achieve unrealistic or overly restrictive body standards, but to identify trends in body fluctuations and support individualized health goals focused on function, vitality, and metabolic wellness.
A More Meaningful Approach to a Healthy Body
Traditional scales measure total body weight but cannot distinguish between muscle, fat, bone, or water. This can mean:
– A person may lose muscle and gain fat without major weight changes
– Someone beginning strength training may gain lean mass while improving health despite minimal scale movement
– Fluid shifts can temporarily affect weight without reflecting meaningful health changes
Body composition offers a more complete picture and helps shift the conversation from simply “losing weight” to improving health, function, and resilience. At St. Jude Wellness Center, body composition assessments on the Inbody scale are used as educational tools to support personalized wellness strategies and ensure that the work our clients put in is generating the desired health outcome. Whether done monthly, quarterly or just once a year, body composition measurements can help guide conversations around recommendations for nutrition, movement, strength, recovery, and healthy aging so that our clients preserve independence and have the highest quality of life possible.
Here are some ways you can access body composition testing here at the Wellness Center:
- Included in all forms of fitness assessments
- Included in all private dietitian and personal training appointments when requested
- Body composition evaluations can be booked as their own Health Coaching 20min appointment
- For those already very familiar with the assessment scores and looking to continue tracking for accountability but do not need professional input or advice with the results, we welcome you to utilize the Inbody independently during any Open Gym session.
- Open Gym sessions are included unlimited for all of our monthly fitness members
- Drops ins to Open Gym are available at a per session-cost for anyone who is not a monthly member
