Intermittent fasting: what is established and what is not
An honest account of the real benefits, the limits, and who it is not suited to.
What we are talking about
Intermittent fasting covers a set of practices: 16:8, with an eight-hour eating window, 5:2, with two very low-intake days a week, one meal a day, alternate-day fasting.
The commonest and the most sustainable is 16:8.
What is reasonably established
It is an effective calorie-restriction tool for some people. Shortening the eating window spontaneously reduces intake in many people. Meta-analyses show weight loss comparable to that from conventional calorie restriction, not better.
In other words: it works because it makes you eat less, not through any particular metabolic mechanism.
Improvement in some markers. Insulin sensitivity, lipid profile, blood pressure: improvements are observed, but often attributable to the weight loss itself.
Simplicity. For many people, not having to decide about breakfast simplifies the day and reduces snacking. That is a real and underrated advantage.
The rest is part of the Sleep & Energy module
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