Meal Timing

Research summary

• A systematic review and meta-analysis in JAMA Network Open found meal timing is associated with anthropometric and metabolic outcomes independent of total caloric intake, and several randomized controlled trials support this directly: early time-restricted feeding improved 24-hour glucose levels and affected circadian and aging-related biomarkers in one trial, while a separate trial found prolonged, controlled daytime eating (versus delayed, evening-shifted eating) improved weight and metabolic markers even when calorie content was matched between groups.
• A trial combining intermittent fasting with early time-restricted eating found benefit for adults at risk of type 2 diabetes compared with standard calorie restriction.
• This is a genuinely active and relatively young research area with real randomized-trial support, though most trials are short-term (weeks to a few months) and use different specific protocols, so how meal timing should be optimized in practice is still being worked out.