Today's Flat Belly Tip: Leafy Greens!

Popeye had it right: spinach rules! Spinach & other leafy greens not only have cancer-preventing carotenoids (organic pigments that enhance the functioning of your immune system & are a great source of vitamin A), but due to their low calorie count, they help shrink your waistline. One cup of spinach contains only about 40 calories, while a cup of broccoli has 55 calories and satisfies 20 percent of your day's fiber requirement - and remember, we like fiber! Most leafy greens are also a good source of calcium, an essential ingredient for muscle contraction. In other words, they help fuel your workouts.

Try for: Three servings daily. Keep a bag of prewashed baby spinach in your fridge and toss a handful into soups, salads, pasta dishes, stir-fries, and sandwiches. When you get sick of spinach, reach for a bunch of arugula, broccoli rabe, or broccolini, a cross between broccoli and Chinese kale. I've even known people to throw some kale in their smoothies - add a little bit each day & you won't notice the taste. Include strawberries & bananas along with the kale so that the texture & flavor doesn't dramatically change.