Did you know cheese is the number one source of saturated fat in our diets? Ely recommends choosing a better sandwich topper like Veggie Slices, a soy-based cheese alternative.

Everyone loves to celebrate warm, sunny days with friends, family and an outdoor grill.

But cookouts often mean greasy cheeseburgers, mayonnaise-laden potato salads, sugary soda and other foods that contribute to expanding waistlines. Obesity rates in America have more than doubled for adults since 1980. According to the Centers for Disease Control, 33 percent of Americans are now considered obese.

Don't despair! You can enjoy a lighter cookout without sacrificing fun or flavor. Nutritionist Leanne Ely, author of the "Saving Dinner" cookbook, offers the following tips:

Upgrade the Protein
Trim fat by choosing leaner meat for hamburgers. Buy turkey or vegetarian burgers for guests who do not eat red meat. For extra fiber, serve on whole wheat buns.

Try grilling soy burgers, turkey burgers or grilled chicken with your favorite flavor of Veggie Slices on top for a healthier cookout.

Choose Better Burger Toppings
Hit the produce section for crisp lettuce, tomatoes and onions, and while you're there, pick up soy-based Veggie slices for the cheese lovers in your family. This tasty cheese alternative melts like real cheese but without the saturated fat or cholesterol. Instead of mayonnaise, serve condiments like salsa and spicy mustard, which add fat-free flavor.

Marinate
Make your own marinade by combining sunflower oil, wine, vinegar or citrus juice and some fresh herbs and spices to make even the most mundane piece of meat or poultry taste exotic and delicious without adding extra calories.

Skip Sugary Drinks
It's important to stay hydrated on warmer days, so skip sodas - even diet sodas contain too much sodium. Instead, drink unsweetened iced tea with lemon, orange or lime slices, or make a spritzer by mixing cranberry juice with soda water for a refreshing summertime treat.

Ely says, "The best way to maintain a healthy weight is by eating more lean protein, veggies and whole grains, and avoiding foods high in saturated fat, like dairy. Take advantage of the abundance of fresh produce available during the warmer months and fire up the grill!"

Click here for Leanne Ely's Lunchbox Makeover Tips