I feel exonerated!
Early time-restricted feeding improves insulin sensitivity, blood pressure, and oxidative stress even without weight loss in men with prediabetes (Sutton et al., 2018)
Tl;dr: 8 prediabetic men, 5 week crossover study. When on eTRF, the only rule was basically dinner no later than 3 pm and no snacking thereafter. It was isocaloric because: 1) studies on meal timing and weight loss have been done; and 2) they wanted to test meal timing specifically, not confounded by weight loss.
Also, I think the results are due to meal timing, not fasting duration per se, because of the studies by Jacobs & Hirsh. In brief, they tested meal timing with similar fasting durations and showed people who ate one-meal-a-day all at breakfast lost more weight than people who ate one-meal-a-day all at dinner. First they showed this in an ad lib context and then again in an isocaloric context. Metabolism is gimped at night.
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