I'm on a very strict diet for having polycystic ovarian syndrome (a hormone imbalance that causes insulin resistance as one symptom), so it's basically a low-glycemic diet, just extremely healthy. the combinations of foods i eat at different times of the day really make a difference. for breakfast, i can have one grain (like whole wheat toast [watch out for HFCS]), one dairy (like 6 oz of LF or skim milk, 6 oz greek yogurt without added sugar), one fruit (watermelon, grapes, an apple, etc), and one protein (like two eggs, or 3/4 c LF cottage cheese, or 2 oz LF mozzarella). for lunch i can have unlimited veggies (greens [no iceburg], asparagus, broccoli, tomatoes, etc), and one protein (3 oz lean chicken breast, 3 oz 90/10 beef, 3 oz fish). for an afternoon snack it's a legume (beans) and more veggies. dinner is one protein, more veggies, one grain (1/2 cup brown rice or 2 oz whole wheat or protein-enriched noodles are good), one starchy veggie (carrots or sweet potato). a later snack is 10 peanuts or almonds or 1 Tbsp natural peanut butter. it's super strict but i'm never hungry, and i have to eat this way for my PCOS, it's not just an option for me. but i have dropped about 30 lbs doing it so far, so it works. i do allow myself about one meal a week of whatever i want. it sounds very boring but there are ways to play with it to make really yummy dishes. sweet potato fries are AMAZING, as is cajun shrimp pasta and chicken parmesan, without the breading.
but there are a lot of things you should watch out for when buying food, such as the HFCS (wreaks havoc on your metabolism), other added sugars (there are different names that they are disguised under, i'm sure you can find them on google) and "lite" foods. they put more chemicals in them to make them taste like the original. low-carb diets are generally not as healthy as many people think, because the body needs carbs in the forms of grains and veggies, but obviously it depends which ones you eat that matters. studies have shown that people on low-carb diets have lower brain-functioning because of the lack of energy. be careful with salad dressings too, stay away from the lite and low-fat. it's better to either dip your fork in first, or get the salad on your fork then lightly dip in in a full-fat dressing. you will use way less and still get the flavor. 2 Tbsp is a good measurement. when buying yogurt stay away from the ones with added sugar. the best choice is to buy plain Greek yogurt and add your own fruit in.
when going to restaurants be sure to ask your server lots of questions on how the food is cooked/prepared. it can save you LOTS of extra calories. order veggies for a side, and have them put the salad dressing on the side are a couple good tips.
jeez i'm a health freak.