Emerging research suggests that when you eat may be just as important as what you eat.
Nutrition experts have long suspected that skipping meals early in the day may result in increased hunger, which leads to overeating later in the day. In fact, several studies confirm that missing breakfast is associated with obesity.
At the same time, research reveals a relationship between eating at night and obesity. Both night-shift work and night-eating syndrome (eating at least 25 percent of your daily calories after dinner and/or waking in the middle of the night to eat) are related to weight gain.
Growing research indicates that eating more of your calories earlier in the day may factor into weight regulation. In a study of 420 individuals, published in the International Journal of Obesity, two groups — early and late eaters — followed a Mediterranean-style diet of similar calorie intake and food composition for 20 weeks. The early eaters consumed their main meal before 3 p.m., whereas the late eaters ate their main meal after 3 p.m. The late eaters lost less weight and at a slower rate.
Impressive results were published in another Obesity study, which included 93 obese women with metabolic syndrome (a clustering of risk factors for chronic disease). They were divided into two diet groups, each containing 1,400 calories. The big-breakfast group received 700 calories at breakfast, 500 calories at lunch, and 200 calories at dinner. The big-dinner group received the reverse: 200 calories at breakfast, 500 calories at lunch, and 700 calories at dinner. In the 12-week study, the average weight loss in the big-breakfast group was 17.8 pounds, versus 7.3 pounds in the big-dinner group.
Although the body systems involved in meal timing and weight loss are not fully understood, scientists believe that satiety hormones, such as leptin and ghrelin, may be involved. And because the body's metabolism is strongly linked to circadian rhythms, the disruption in the body clock may lead to weight gain. We live in a culture where the norm tends to be eating the main meal later in the day. But if weight management is the goal, eating more of your calories earlier is certainly worth striving toward.
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