If you've recently heard the words "insulin resistance" from your doctor, or read them online and wondered whether they apply to you, you're in good company. It's one of the most common metabolic problems in older adults, and also one of the most misunderstood.
So let's slow down and talk about it plainly: what it is, why it tends to show up after 50, and what you can actually do about it, starting this week.
What is insulin resistance?
Insulin is a hormone made by your pancreas. Its job is to help sugar (glucose) move from your bloodstream into your cells, where it's used for energy. I like to think of insulin as a key that unlocks your cells.
With insulin resistance, the cells in your muscles, fat, and liver don't answer that key the way they should. Your pancreas makes more insulin to compensate, and for a while that works. But the pancreas may eventually struggle to keep up. Blood sugar starts to climb, first into the prediabetes range and, for some people, into type 2 diabetes.
Here's the tricky part: insulin resistance usually has no symptoms. Most people feel perfectly fine, often for years. That's why so many people don't know they have it.
There isn't a routine test for insulin resistance itself. What your doctor can check is your blood sugar, usually with an A1C test (a 3-month average) or a fasting glucose test. An A1C of 5.7% to 6.4%, or a fasting glucose of 100 to 125 mg/dL, falls in the prediabetes range (ranges from the NIDDK).
Why it becomes more common after 50
Age itself is a risk factor, along with family history, which we can't change. But many of the other pieces are things we can influence:
Muscle. Muscle is where much of the sugar in your blood goes after a meal. Muscle mass tends to decline as we age, so there's simply less of it to soak that sugar up.
Activity. Many of us move less than we used to, and sitting for long stretches works against steady blood sugar.
Weight around the middle. Extra fat around the belly is closely tied to insulin resistance.
Sleep and stress. Sleep often changes after 50, and conditions like sleep apnea become more common. Ongoing stress plays a part, too.
A whole-person way of looking at it
This is where I find the functional medicine perspective so helpful. Instead of looking at blood sugar as one number in isolation, it asks why the body got here. Insulin resistance rarely has a single cause. It sits at the crossroads of how we eat, move, sleep, handle stress, and carry inflammation. The good news is that the same everyday habits help on every one of those fronts at once.
Can insulin resistance be reversed?
For many people, yes, and this is the hopeful part. In a large, well-known US trial called the Diabetes Prevention Program, adults at high risk who made modest lifestyle changes (more movement and a little weight loss) cut their risk of developing type 2 diabetes by more than half. People 60 and older did especially well.
Let that sink in: age is not a reason to give up. If anything, it's a reason to start.
How to start improving insulin sensitivity, naturally
There's no single magic move. What works is a handful of everyday habits, done steadily. Here's where I encourage people to begin.
1. Move your muscles, and build them
Every time your muscles work, they pull sugar out of your blood, and over weeks of regular movement, they get better at listening to insulin. Aim for about 150 minutes a week of moderate activity like brisk walking, plus some strength work two or more days a week.
Strength training deserves special mention after 50, because it helps protect the very muscle that does so much of the work. You don't need a gym. Sit-to-stands from a chair, wall push-ups, carrying groceries, gardening, and resistance bands all count.
2. Walk after meals and break up sitting
One of my favorite simple habits: a 15-minute walk after meals; even 10 minutes helps. And if you sit for long stretches, get up and move for a couple of minutes every half hour or so. Small, frequent movement can noticeably soften the blood sugar rise after eating.
3. Build a steadier plate
I like the Harvard Healthy Eating Plate as a simple picture: half your plate vegetables and fruit (mostly vegetables), a quarter protein, a quarter whole grains or beans, and healthy fats like olive oil. A Mediterranean style of eating fits beautifully here. In my kitchen, that looks like greens from the garden, a good portion of fish, eggs, chicken, or lentils, some fiber-rich beans or whole grains, and a drizzle of olive oil with a few nuts. Swapping sweetened drinks for water or unsweetened tea is one of the easiest wins of all. It's satisfying food, not a deprivation diet.
4. Aim for modest weight loss, if you need it
If you have extra weight, you don't need to lose a lot. Losing about 5% to 7% of body weight can make a meaningful difference. For a 200-pound person, that's about 10 to 14 pounds. After 50, how you lose it matters: protect your muscle with enough protein and strength work.
5. Protect your sleep
Short, broken sleep makes it harder for your body to handle sugar the next day. Aim for about 7 or more hours, keep a steady bedtime, and treat sleep as part of your health plan, not a luxury. If you snore heavily or wake up exhausted, mention it to your doctor.
6. Calm your stress response
Stress hormones like cortisol can push blood sugar up. This is the mind-body piece, and it matters. Simple practices like slow breathing, time outdoors, prayer or meditation, a walk with a friend, or a quiet sound bath can help your nervous system settle.
A word about patience
Insulin resistance usually develops over years, so give yourself more than a few weeks to turn it around. Start with one habit. Repeat it until it feels normal. Then add another. That's not a slow approach; it's the approach that lasts.
And please keep your doctor involved. Ask about your A1C or fasting glucose, and retest as recommended so you can see your progress. If you take medication for blood sugar or blood pressure, talk with your doctor before changing medicines or making big lifestyle changes, because your needs may shift as your habits improve.
Want a step-by-step plan?
I created a free course, Insulin Resistance & Prediabetes 101, to walk you through all of this one doable step at a time: understanding your numbers, building steadier meals, moving in ways that work for your body, and putting it all into a plan you can keep.
With steady encouragement, Dr. LaVera
Sources
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Insulin Resistance & Prediabetes. https://www.niddk.nih.gov/health-information/diabetes/overview/what-is-diabetes/prediabetes-insulin-resistance
Cleveland Clinic. Insulin Resistance. https://my.clevelandclinic.org/health/diseases/22206-insulin-resistance
The Institute for Functional Medicine. Lifestyle Interventions for Patients With Metabolic Syndrome. https://www.ifm.org/articles/lifestyle-interventions-patients-metabolic-syndrome
The Institute for Functional Medicine. Nutrition and Impacts on Hormone Signaling. https://www.ifm.org/articles/nutrition-impacts-hormone-signaling
Harvard T.H. Chan School of Public Health, The Nutrition Source. Simple Steps to Preventing Diabetes. https://nutritionsource.hsph.harvard.edu/disease-prevention/diabetes-prevention/
Harvard T.H. Chan School of Public Health, The Nutrition Source. Healthy Eating Plate. https://nutritionsource.hsph.harvard.edu/healthy-eating-plate/
Harvard T.H. Chan School of Public Health, The Nutrition Source. Sleep. https://nutritionsource.hsph.harvard.edu/sleep/
Harvard T.H. Chan School of Public Health, The Nutrition Source. Stress and Health. https://nutritionsource.hsph.harvard.edu/stress-and-health/
Diabetes Prevention Program Research Group. Reduction in the incidence of type 2 diabetes with lifestyle intervention or metformin. New England Journal of Medicine. 2002;346:393–403. https://pubmed.ncbi.nlm.nih.gov/11832527/
Jiahao L, Jiajin L, Yifan L. Effects of resistance training on insulin sensitivity in the elderly: a meta-analysis of randomized controlled trials. J Exerc Sci Fit. 2021;19(4):241–251. https://pubmed.ncbi.nlm.nih.gov/34552636/
All content is educational and not a substitute for personalized medical care. Please talk with your doctor or health care provider before changing your diet, physical activity, or medications.
LaVera J. Forbes, PhD, MS, CHN, is the founder of Dr. LaVera’s Healthy Aging, LLC. Find free healthy aging resources at drlavera.com.
© 2026 Dr. LaVera’s Healthy Aging, LLC. All rights reserved.