A 4-week plan backed by the latest science that unlocks the key to melting fat for good.

A staggering 70 percent of Americans are now vitamin D deficient. And almost 70 percent of Americans are overweight or obese. Of all the variables we can control, vitamin D may play the most crucial role of all in controlling appetite and our natural ability to either store or burn fat. The answer is in what you eat. According to new, breakthrough research, you can nearly double your weight loss in the same amount of time, and zero in on your #1 trouble spot-your tummy-by maximizing one thing: vitamin D.

The 7-Day Slim Down by Alisa Bowman and the Editors of Women's Health is packed with delicious, D-fortified foods that melt fat fast-readers can expect to lose up to 7 pounds on the 7-Day Speed Melt, then transition into the full 4-Week Fat Melt. The menus are designed specifically to superdose the body with D, which promotes satiety and eliminates diet-busting cravings. There's even a unique "Summer" and "Winter" maintenance plan created around foods of the seasons, to further boost mood and short-circuit diet-induced depression. And since readers can enjoy snacks, dessert, even a glass of wine-it's a plan they can follow for life!

Including an easy-to-follow, customizable exercise plan and mouth-watering-yet-slimming recipes, The 7-Day Slim Down unlocks the body's fat-melting potential to beat hunger, maximize weight loss, boost energy, and dramatically improve one's health.