Is Time-Restricted Eating good for metabolic health?

Yes — the evidence for this is strong. Time-restricted eating (TRE) is supported by several well-designed randomized controlled trials, including a large NEJM trial that found calorie restriction with or without TRE, and a JAMA trial on early time-restricted eating, both showing meaningful weight loss but generally similar results whether or not meals were also restricted to a specific window. That's reflected in an evidence score of 84/100 for its role in metabolic health, drawn from 9 studies (5 RCTs), with an estimated impact on longevity rated moderate (41/100).