Eating all meals within a 6-hour window in the morning and early afternoon for 4 days lowered average blood sugar levels and reduced spikes in blood sugar throughout the day in overweight people compared to eating over a 12-hour window.

When healthy young men only eat between noon and 8pm for five days straight, it doesn't change how their blood sugar levels respond after eating a high-fat meal

When healthy young men only eat between noon and 8pm for five days straight, it doesn't change their baseline blood sugar levels

When healthy young men only eat between noon and 8pm for five days straight, it doesn't change how their insulin levels respond after eating a high-fat meal

When healthy young men only eat between noon and 8pm for five days straight, it doesn't change their baseline insulin levels

After four days of eating only until 2 p.m., people lost a tiny bit of weight—about half a pound—mostly from water and stored carbs, not fat.