Can it be that simple, though? Does it work? And what is the scientific basis for fasting? As a registered dietitian and expert in human nutrition and metabolism, I am frequently asked such questions.
But what about eating breakfast and then small meals throughout the day to keep the body’s metabolism running? After all, that’s the conventional wisdom that many of us grew up with.HUMAN METABOLISM 101 This triggers the release of insulin from the pancreas. The insulin helps tissues throughout the body take up the glucose and lipids, which supplies the tissues with energy.
When the body reaches a true fasting state — about 18 hours to two days without additional food intake — the body’s stores of glycogen are depleted, and tissues like the heart and skeletal muscle start to rely heavily on fats for energy. That means an increase in the breakdown of the stored fats. What happens when you break the fast? The cycle starts over. Blood glucose and lipids return to basal levels, and energy levels in the body are seamlessly maintained by transitioning between the metabolic pathways described earlier. The neat thing is, we don’t even have to think about it. The body is well-equipped to adapt between periods of feasting and fasting.If an “all-or-nothing” dietary approach to weight loss sounds appealing to you, chances are it just might work.
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