Thanks to that late brunch on a lazy vacay morning, it’s easier to eat meals later than usual. But that schedule isn’t doing you any favours, according to a study in the International Journal of Obesity that tracked 420 obese people during a 20-week weight-loss program. The study subjects followed a Mediterranean diet, so lunch was their main meal. Those who ate their main meal early (before 3 pm) lost almost five more pounds than those who had their main meal late (after 3 pm)—even though both groups consumed the same number of calories and exercised the same amount. The researchers aren’t sure why this happened, but one theory is that eating later can influence circadian rhythms that affect metabolism. Registered dietitian and nutritionist, Janis Jibrin, who is also the author of The Pescetarian Plan, recommends eating lunch between noon and 1pm, having a midafternoon snack, and eating dinner no later than 7pm.