Is he drinking decaf coffee or regular? Atkins states that regular coffee can affect blood sugar and stall weight loss for some people. If he's like most men, he's probably not drinking enough water, and he needs to drink a lot in order to help flush out the fat he burns. A lot. More than he can imagine. For his weight, 3 -4 liters is probably better than the minimum two that Atkins recommends. And the veggies are a must. If he eats two cups of salad with a high fat dressing before his entree, he'll probably feel full with a much smaller protein serving.