Many experts think that by eating a high-fat or keto diet, it’s possible to become a more efficient fat burner and get more energy from ketones.
Intermittent fasting may have a similar effect, helping people become better at fueling themselves from fat.
Ultramarathon world-record holder Zach Bitter recently explained how changing his diet helped improve his performance.
Our bodies might work better when we’re burning fat as fuel.
From a health perspective, burning fat rather than primarily getting fuel from carbs might help stabilize blood sugar. From an athletic perspective, being a fat-burner might help some people recover more quickly and perform at a higher level.
Zach Bitter is an ultra-marathon runner who holds the world record for the longest distance run in 12 hours (101.77 miles). On a recent episode of his new podcast, Human Performance Outliers, Bitter discussed his decision to switch to a keto-like diet designed to turn him into a more efficient fat-burner.
In 2011, Bitter said, he’d been eating what most would consider a healthy, whole-food, high-carb diet that might be expected of someone running 50-mile races. But he was hurting, waking up throughout the night, seeing his energy levels fluctuate, and dealing with chronic swelling in his ankles.
Instead of cutting back on racing, he changed what he ate, embarking on a whole-food, high-fat diet. He cut out most carbohydrates, relying instead on foods like stir frys, bacon, eggs, nuts, and seeds. He often cooked with coconut oil or duck fat.
Although he still consumed some carbs while racing, Bitter said the dietary changes made him feel less need to eat while running. And overall, he felt better.
“It was pretty eye-opening to me — in the first four weeks, all of those symptoms going away, the swelling, the sleeping [problems], the energy levels throughout the course of the day,” Bitter said on the podcast.
Why going high-fat or keto might help
Becoming a more efficient fat-burner is the main idea behind the popular keto diet and behind intermittent-fasting programs as well. There are even new supplements designed to push your body to become a supercharged, fat-burning — or “fat-adapted” — machine.
Most of us burn sugar for fuel first. Our bodies burn through easily accessible glycogen energy stores, which we get from breaking down carbohydrates. After we burn through our supply of those, our bodies can eventually start getting energy via ketones, which are produced from fatty acids (basically, energy from fat).
People whose bodies …
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