Go for ground sirloin, the leanest ground beef.
A 3-ounce serving has 196 calories and 10 grams of fat. The next leanest is ground round (for 218 calories, 13 grams of fat), then ground chuck and ground beef (both about 231 calories, 15 grams of fat).
Don’t forget the eggs.
Eggs have been much maligned over the years, but the fact is, they are an excellent and inexpensive source of protein and the most nutritionally complete of all protein sources. One large, hard-boiled egg contains 7 grams of protein and has just 2 grams of saturated fat. To avoid the saturated fat altogether, use the egg whites and throw out the yolks. Or you can dress that egg up (and get in a serving of veggies) by making an omelet and folding in iron- and fiber-rich spinach. In studies, people who ate eggs and toast for breakfast stayed full longer and ate significantly fewer calories the rest of the day than people who ate a bagel and cream cheese. Eggs do contain a fair amount of cholesterol, but dozens of studies have shown that it’s saturated fat, not dietary cholesterol, that raises people’s cholesterol the most.