Preventing Obesity Given the chronic diseases and conditions associated with obesity and the fact that obesity is difficult to treat, prevention is extremely important. What's in the Food You Eat? Most food additives are safe and beneficial, experts say. What's more, they're everywhere. Calculating Calories and Fat Grams Here's a formula to help you figure out how many calories and fat grams you need each day to maintain your current weight. Cholesterol in the Blood The cholesterol in your blood comes from the foods you eat and your liver—but your liver makes all of the cholesterol your body needs. Components of Food When trying to make heart-healthy changes to your lifestyle and diet, it is helpful to know some basics about nutrition. 'Choose My Plate' Quiz How many cups of vegetables should you eat each day? How about milk? Meat? The My Plate eating plan can help you find out. Preventing Cardiovascular Diseases Living a healthier lifestyle can help prevent heart disease. Don't smoke, eat a heart-healthy diet, and get regular exercise.