The American Heart Association recommends eating omega-3-rich fish, such as tuna, twice a week for good health. It's wise, however, to vary what you choose. Because tuna is a source of mercury, you should avoid eating it daily, especially higher-mercury varieties like albacore tuna.

Unless you eat eggs as part of a large meal right before bed, they aren't likely to keep you awake at night. In fact, eating eggs at night may actually help you sleep better, according to an article published on the "Daily Mail" website.

When you're changing how you eat to lose weight, your biggest battle may be controlling your hunger. While many people lose weight following the SlimFast plan, liquid meal replacements tend not to curb your appetite as well as solid food.

Flaxseeds are high in fiber, vitamins, healthy fats and several minerals. They blend in easily with smoothies, cereals and baked goods to help give you a boost on your fiber and nutrient intake. Even though flaxseeds are a highly beneficial addition to your diet, eating too many can give you a bellyache.

Food additives are beneficial because they help prolong the shelf life of certain items, as well as enhance the flavor of some foods. That doesn't mean, however, that food additives are good for you. Butylated hydroxyanisole, or BHA, is one food additive to consider nixing from your diet. Though the U.S.

Lettuce is low in calories and rich in a number of nutrients you need to stay healthy. But if you're not completely digesting the leafy greens, or it gives you stomach trouble, you may not enjoy eating it. Taking your time to thoroughly chew lettuce or eating smaller amounts may help improve digestion.

If you experience heartburn as a result of eating gluten, it may be an indication of gluten intolerance. Gluten is a protein found not only in wheat but also rye, barley and any foods made from these particular grains. Contact your doctor and work with him to rule out other potential causes.

Fennel seeds are used in cooking to add flavor to foods, including sausages and fish dishes. Some people also chew the seeds after meals to help with digestion and limit gas. While the small amounts typically used in food are considered safe, using medicinal amounts of fennel seeds isn't safe for everyone.

Gastritis occurs when the lining of your stomach becomes inflamed. This includes sudden inflammation or chronic inflammation that lasts for a long time and can cause stomach pain and discomfort after eating.

Caffeine and alcohol in small doses can be perfectly acceptable parts of your diet, but too much can negatively affect your health. A nutritious and well-balanced diet helps keep the kidneys, bladder and ureters healthy, but too much alcohol or caffeine can interfere with the normal function of your urinary system.

Your lymph system, which is made up of vessels, nodes and organs, is responsible for collecting and filtering fluid from your blood that contains a number of substances, including bacteria, to help maintain fluid balance and protect you from infection.

It sounds contradictory, yet it’s true: You may need to avoid milk when you have diarrhea, but a milk product -- yogurt -- can help prevent it. Some differences among types of yogurt, such as whether it contains fruit, won't impact diarrhea. But a few factors are important.