Most people try to lose fat with hard cardio, but low-intensity walking can work better when you do it at the right moment.
Thomas DeLauer, a nutrition coach, explains that walking at roughly half of your maximum effort (about 50–60 percent of your VO₂ max, the measure of how much oxygen your body can use) makes the body rely mainly on stored fat for energy. The key is insulin. After you eat, the hormone insulin rises to deal with the sugar from food. High insulin blocks the release of fat from fat cells. When insulin is low—first thing in the morning before breakfast, or two to three hours after a meal—fat cells open and more fat enters the blood to be burned during an easy walk.
This idea fits well with science. A Korean study followed obese women who walked three times a week for 50–70 minutes at a gentle pace for twelve weeks. They lost both the outer (subcutaneous) and the deep (visceral) belly fat and improved blood-sugar control, with no change in diet.
Another review on healthy ageing shows that regular brisk walking, about 30 minutes most days, lowers heart-disease risk, blood pressure and even dementia risk, all while putting little stress on the joints.
How to use walking for fat loss
- Fasted walk: if you can, take a 30-minute walk before breakfast.
- Between-meals walk: if mornings are busy, walk two to three hours after any meal, when insulin has fallen but energy is still good.
- Post-meal walk for blood sugar: a short ten-minute stroll right after eating helps blood sugar but is less effective for burning fat.
- Pace and feeling: you should be able to hold a normal conversation; faster breathing means you are working too hard and using more sugar than fat.
- Frequency: aim for at least three longer walks a week and add shorter walks on other days.
- Strength work matters: add two or three weekly strength sessions to protect muscle while fat goes down.
Definitions
- Insulin: hormone that moves sugar from blood into cells and blocks fat release.
- VO₂ max: the highest rate at which someone can use oxygen; half of that rate is a comfortable walk.
- Visceral fat: fat stored deep around organs; linked to heart disease and diabetes.
Walking done this way keeps joints safe, preserves muscle, improves mood, and over weeks can bring body-fat levels close to the 12 percent mark where abdominal muscles start to show.
Why 12% body fat goal for men?
At about 12% body fat, a man usually strikes a good balance between health and appearance. At this level, enough fat remains to support vital functions, such as cushioning the organs and keeping hormones in balance, while being low enough to allow clear muscle definition, especially around the abdomen. Men at 12% body fat often enjoy good metabolic health, with lower risk of insulin resistance and heart disease, and they typically feel energetic and strong without overly strict dieting.
This 12% target is specifically for men. Women naturally carry more fat because it is essential for normal reproductive and hormonal function. A healthy body-fat range for women is generally between 18% and 25% – with 17% being an athletic level – depending on age and activity level. If a woman’s body fat drops below about 15%, she may experience menstrual irregularities, lower bone density, or fertility issues. In other words, what is “lean” and healthy for a man can be too low for a woman’s well-being.
Effect of walking exercise on abdominal fat, insulin resistance and serum cytokines in obese women – Journal of Exercise Nutrition & Biochemistry, 10 September 2014
Twelve weeks of thrice-weekly walking at 50–60 percent VO₂ max reduced both subcutaneous and visceral belly fat and improved insulin resistance in obese middle-aged women.
Research quoted by DeLauer on meal timing and fat use during exercise – International Journal of Obesity, 2019.
In fasted walkers, blood levels of free fatty acids were higher before and during exercise than in walkers who ate breakfast first, showing greater fat use. (Original study link referenced in Body Network article.)
The multifaceted benefits of walking for healthy aging: from Blue Zones to molecular mechanisms – GeroScience, 26 July 2023.
Review summarizing how daily brisk walking lowers risk of cardiovascular disease, diabetes and cognitive decline.
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