My client Dana, 52, told me her scale had been dead steady for two years. I had her grab a tape measure instead. The number we found changed the plan for the next three months. If you’re over 50, that tape measure might be the most useful tool in your gym bag.
A big study in the Journal of the American College of Cardiology (JACC) pooled 15 long-running studies covering more than 259,000 adults with no known heart disease, then followed them for about 20 years. People whose weight looked normal or only slightly high but carried extra fat around the middle had a 15% to 50% higher risk of most of the outcomes tracked, including heart attack, stroke, and heart failure.
The journal’s editor-in-chief, Dr. Harlan Krumholz, put it bluntly: “It is time to abandon a sole focus on body mass index.” I’ve been saying a quieter version of that in the gym for years.
Measure It Like a Researcher
Most of us have wrapped a tape around our middle. Few of us have done it the way researchers do.
Forget where your waistband sits. The World Health Organization and the International Diabetes Federation recommend measuring at the midpoint between your lowest rib and the top of your hip bone. The US National Institutes of Health uses a slightly lower spot: the top of the hip bone itself. Stand up, press gently along your side until you feel the bottom edge of your ribcage, find the bony ridge at the top of your hip. The tape goes halfway between the two.
That gap matters more than it sounds. Researchers in Brazil measured 119 overweight adults, average age about 50, at six different spots around the middle. The largest average gap between spots came to roughly 7 cm in men and 10 cm in women — close to 4 inches, from tape placement alone. Bony landmarks also stay put as your body fat changes, which makes them the better choice if you plan to track your waist over months.
Then take the reading like a researcher would:
- Measure on bare skin, never over clothing.
- Keep the tape level all the way around. A mirror helps.
- Breathe out normally, then read the tape. No sucking in.
- Take two readings. If they disagree, take a third.
Stick to the same time of day each measurement, so each reading compares like with like.
Coach’s Math: Compare Waist to Height
A waist number on its own is hard to read. The same measurement means something different on a tall frame than on a short one.
The UK’s National Institute for Health and Care Excellence (NICE) advises adults to keep their waist measurement to less than half their height, for adults with a BMI below 35. The math takes seconds: divide your waist by your height, in the same units. Under 0.5 is the target.
At 5 feet 8 inches, or 68 inches tall, that means a waist under 34 inches.
One caveat if you’re over 60. Tom Sanders, professor emeritus of nutrition at King’s College London, pointed out that people over 60 tend to lose between 2.5 and 7.5 cm in height, and more with osteoporosis. His concern: the half-your-height rule would label far more older adults as at risk of diabetes than the International Diabetes Federation’s own cutoffs do. So if you’re past 60 and your result lands close to the line, treat it as a flag worth raising with your doctor.
Why the Scale Can Lie — Both Ways
BMI is your weight divided by your height squared. It’s quick, and it’s everywhere. But it can’t see where fat is stored.
In the JACC study, among people with a normal BMI, 5% had a high waist circumference and 18% had a high waist-to-hip ratio. Among those classed as overweight, the figures were 39% and 40%. A scale would never flag those people.
The surprise runs the other way too. People classed as obese but with a small waist had heart risks no higher than people of normal weight with a small waist. Read that carefully. It describes averages across a very large group, and it says nothing to suggest excess weight is harmless. The useful takeaway is narrower: fat around the middle appears to carry risk that BMI alone misses. And keep two limits in mind — this was an observational study, so it shows a link rather than proving cause, and it took each person’s waist measurement only once, with no data on diet or physical activity.
What Actually Moves It
Plenty of people notice their waist growing in their 50s even when their weight barely moves. There are real reasons for that.
For women, the menopause transition is a big one. During the reproductive years, estrogen encourages the body to store fat on the hips, thighs, and buttocks. As estrogen falls, storage shifts toward the abdomen and toward visceral fat — the deeper fat packed around the internal organs. University Hospitals menopause specialist Dr. Rachel Pope notes that for women in the transition, the same active lifestyle can still result in fat redistribution to the belly, driven by the metabolic changes that hormone shifts set off.
Men aren’t exempt. Aging itself drives a gradual loss of muscle mass, and less muscle means a lower resting metabolism. Visceral fat is associated with a higher risk of insulin resistance, cardiovascular disease, and type 2 diabetes. That’s why this belongs in a heart conversation.
So what actually moves the number? Two levers have real evidence behind them.
Add soluble fiber to your plate. Soluble fiber is the kind that dissolves into a gel as it’s digested. A five-year study from Wake Forest Baptist Medical Center followed 1,114 African American and Hispanic American adults and measured their abdominal fat with CT scans at the start and again at the end. More soluble fiber was linked to a slower build-up of visceral fat, with no such link for the fat just under the skin. The amount involved was modest: each extra 10 grams of soluble fiber a day, which the researchers said you could get from two small apples, one cup of green peas, and half a cup of pinto beans. Keep the claim in proportion — it was an observational study in one population, and fiber on its own won’t flatten anyone’s middle. But it’s a food change with evidence tied to visceral fat specifically, and beans and peas are cheap. If you eat very little fiber now, add it gradually over a few weeks.
Move most days, and keep some strength work. You can’t spot-reduce the fat around your organs. Crunches won’t reach it. You can reduce it overall. Harvard Health advises at least 150 minutes of moderate-intensity activity a week, alongside a heart-healthy diet, to work on abdominal fat. In the Wake Forest study, the more active participants also built up visceral fat at a slower rate over the five years. What did “active” mean there? The lead researcher defined moderate activity as exercising vigorously for 30 minutes, two to four times a week. After 50, add some strength work to the mix — Dr. Pope recommends strength training to combat muscle loss, which is part of why the middle changes in the first place.
Quick note before you act: this is general education, not professional medical advice. If you have a heart condition, joint problems, or any symptoms during exercise, check with your doctor before stepping things up.
Bring the Number to Your Doctor
This last step is the one that turns a tape measure into something useful. Write down your waist measurement, your height, and the date. Bring them to your next appointment and ask how that waist fits alongside your blood pressure, cholesterol, and blood sugar results.
Don’t assume your doctor already has the number on file. The study’s lead author, Dr. Zeina Dardari, encouraged clinicians to consider where fat is carried across the entire BMI range when they assess heart risk. Bringing your own measurement makes that conversation easy to start.
Then measure again in a month, at the same spot and the same time of day. One reading is a snapshot. A few readings over time show you which way you’re heading.
Your Move:
- Today: find your two landmarks — lowest rib, top of hip bone — and mark the midpoint. Five minutes, bare skin, one breath out.
- This week: measure twice, same time of day. Divide waist by height. Under 0.5 means you’re in the target zone.
- Next checkup: bring the number in writing, and add a handful more beans, peas, or an apple to your plate this week.
Your scale answers one question: how much you weigh. Your waist answers a different one. For your heart, that second answer may be the one worth keeping.