Sarcopenia in older adults is an important part of the conversation about BMI, weight, and healthy aging.
In this episode of The Geriatric Dietitian Podcast, we’re talking about why muscle matters more than simply looking at the number on the scale.
Sarcopenia is the decline of skeletal muscle tissue that occurs with aging. This muscle loss matters because muscle is closely connected to function, strength, independence, fall risk, and mortality.
What Is Sarcopenia in Older Adults?
Sarcopenia is the loss of skeletal muscle tissue that occurs with aging.
Muscle loss doesn’t suddenly begin at age 65. It can begin much earlier in adulthood and continue to progress as we get older.
Muscle is involved in so many of the everyday activities that allow older adults to maintain their independence – getting out of bed, getting dressed, brushing their teeth, making breakfast, and moving throughout the day.
This is why sarcopenia isn’t simply about appearance. Muscle loss can impact function, fall risk, independence, and mortality.
Weight Loss and Muscle Loss in Older Adults
When an older adult loses weight, we can’t assume they are only losing body fat. They may also be losing muscle.
This becomes particularly important for an older adult who already has less muscle. Losing additional muscle can increase fall risk, make everyday activities more difficult, and contribute to declining independence.
This is why seeing a lower number on the scale isn’t automatically a positive thing in an older adult.
Instead, we need to look at the bigger picture. Are they losing muscle? Are they getting weaker? Are they becoming more frail?
Sarcopenic Obesity
Sarcopenic obesity describes someone who has higher body fat along with low muscle mass. Someone can live in a larger body and still have inadequate muscle. BMI alone cannot tell us the difference.
Two people can have the exact same BMI while having very different body compositions. One person may have substantially more muscle than the other.
This is one reason why focusing only on weight or BMI can miss an important part of the picture in older adults.
Sarcopenia and Mortality
In this episode, we look at several studies examining sarcopenia, body composition, and mortality in older adults.
Research discussed in the episode found associations between sarcopenia and increased mortality, including among hospitalized older adults. Research examining body composition has also found that having more muscle was associated with lower all-cause and cardiovascular mortality.
The research discussed throughout this episode continues to point us back toward the importance of muscle.
Frailty, BMI, and Body Composition
Frailty is another important part of this conversation. As muscle is lost, older adults can become weaker and more frail.
Research discussed in the episode found that among frail older women, very low body fat or a pronounced decline in body fat was associated with increased mortality. In the same research, women with BMIs that would traditionally fall into the overweight or obese categories had lower mortality.
Our bodies change as we age, and the same BMI doesn’t necessarily mean the same thing in a younger adult and an older adult.
This is why body composition matters. How much muscle does someone have? Are they maintaining it? Are they strong? Are they maintaining their function and independence? Are they experiencing unintended weight loss?
These questions can tell us more than simply looking at the number on the scale.
The Takeaway: Preserve Muscle
The biggest takeaway from this episode is to preserve muscle.
We don’t want to focus so heavily on lowering someone’s weight that we sacrifice the muscle supporting their strength and independence.
BMI is a number, but muscle gives us important information about function, strength, and resilience.
In the next episode of The Geriatric Dietitian Podcast, we’ll continue this conversation by looking at unintended weight loss in older adults, why it’s concerning, and why it’s something we need to pay attention to.
Learn More About BMI in Older Adults
Want to dive deeper into BMI, aging, mortality, muscle loss, and nutrition?
Read: BMI in the Elderly: What You Need to Know
https://thegeriatricdietitian.com/bmi-in-the-elderly/
Download my free Healthy Aging Nutrition Guide:
https://thegeriatricdietitian.myflodesk.com/
This is Part 3 of my five-part podcast series on BMI in older adults.