AVOCADO 
Per avocado:
322 calories
29 g fat (4 g saturated, 20 g monounsaturated)
13 g fiber
4 g protein
Never fear this full-fat Mediterranean-diet staple: It's teeming with healthy monounsaturated fats (also found in olive oil), which have been linked to lowered LDL cholesterol levels and weight loss. In fact, a recent longitudinal study published in The New England Journal of Medicine found that the healthy-fat Mediterranean diet was more effective than a diet that avoided fats altogether—so go ahead and indulge!
EGGS
Per 1 large scrambled egg:
102 calories
7 g fat (2 g saturated)
7 g protein
A British study found that people who increased the percentage of protein-based calories in their diet burned 71 more calories a day (that's 7.4 pounds a year!). Jumpstart your metabolism as soon as you wake up with a protein-rich breakfast of scrambled eggs. (Go to eatthis.com for other great no-diet weight-loss secrets.)
GRAPEFRUIT
Per grapefruit:
104 calories
4 g fiber
2 g protein
A grapefruit a day in addition to your regular meals can speed weight loss. The fruit's acidity slows digestion, meaning it takes longer to move through your system, and you'll end up feeling fuller, and more satisfied, for longer. And the vitamin C-packed grapefruit works to lower cholesterol and decrease risk of stroke, heart disease, and some types of cancer.