Dr. Leslie Langevin, a dietician at Whole Health Nutrition , has no doubts. An ideal weight loss plan has a caloric breakdown that revolves around lunch as the most abundant meal of the day.

In support of her thesis, Langevin reports a study that appeared in The American Journal of Clinical Nutrition , in which a sample of 80 women was divided into those who ate the most for lunch and those who ate more for dinner: the first group lost the most weight (two extra pounds per month).

Dr. Langevin then suggests allocating 40 percent of your daily calories to lunch . 

How? The ideal weight loss plan for an overweight woman whose total daily calorie requirement is around 2000 calories could be a 1500 calorie daily plan.
450 calories for breakfast / 600 calories for lunch / 450 calories for dinner
OR, if you like snacks:
400 calories for breakfast / 600 calories for lunch / 100 calories for snack / 400 calories for dinner.
For a total of 1500 calories that allow you to lose 3.5 kg per month.

In this article we see both a 1250 calorie weight loss plan to lose 5 and a half pounds a month and a plan to lose 3 pounds a month with a big lunch.