Just two tiny "Darling Clementines" can fulfill the USDA's recommended daily requirement of Vitamin C for an average person on a 2,000 calories-a-day-diet. And, of course, citrus consumption has been consistently shown to boost the human immune system, help keep bones and teeth healthy and provide you with extra protection against skin disorders and diseases such as the common cold.

No wonder fans love them. Just two a day can keep dangerous diseases at bay and even help you quit smoking!

That's because "Darling Clementines" are low-cal and chockfull of nutritional goodness. A 2-year study released by the Spanish Ministry of Commerce and Tourism reports that they are a significant source of essential sugars, dietary fiber, calcium and vitamin A.

Nutrition-filled avocados help to meet your daily needs for fiber, potassium, folic acid, and other B-vitamins and vitamin E. Avocados also contain antioxidants and other substances that are believed to lower blood cholesterol and prevent some kinds of cancer.

The mono- and poly-unsaturated "good" fats in avocados are recommended as part of a heart-healthy diet, and at just 75 calories per quarter, they are prefect for diabetics and anyone on a low-carb diet.

Avocados are a perfect substitute for mayonnaise, add flair to salads or sandwiches and can be used as a garnish for tacos or soups, thrown on the grill, or used as a topping for pizza.

Blue Planet Persian limes are chockfull of Vitamin C, an essential ingredient in fighting cold and 'flu infections and skin disorders. In addition, Persian limes contain disease-combating antioxidants, that are believed to protect against heart disease and some forms of cancer.

What's, more, you can add Persian limes to your diet in a variety of delicious ways. They can be used to create exotic hot and cold drinks, dips, or desserts and add zest to many seasonings and marinades. Limes add flavor to fish, seafood and meat dishes, soups, Southwestern and Mexican menus, and make the perfect garnish for every table.

Lemons are thought by some to be nature's secret weapon for disease fighting and are a healthy addition to the diet at any time. Because of their fragrant aroma and distinctive taste, lemons can be included in a variety of food and drink recipes, are popular in desserts, and will perk up the flavor of most of your meat and seafood dishes.

What's more, it's no accident that lemon juice is a world renowned remedy for colds and sore throats. Lemons are literally loaded with vitamin C,which is why in times past they were used to prevent scurvy and help keepsailors' bones and teeth healthy. Today, many people firmly believe that just two lemons a day in a glass of water can help detoxify the body, boost the immune system and improve the body's ability to defend against infection. Lemon juice is even used for insect bites to help promote healing and reduce swelling.

With so much going for it, it's not surprising that the lovely lemon has been prized for hundreds of years and was often traded for other precious items.

Fresh table grapes have been grown for food in different parts of the world since prehistoric times, but have only recently been recognized as a true superfruit for their exceptional nutritional richness, antioxidant, disease-fighting properties combined with sugar sweet taste.

Grapes are chock full of vitamins and minerals.Their cardio-protective secret ingredient is resveratrol, a potent antioxidant which researchers say can actually prolong life, protect the cardiovascular system and combat the effects of a high-fat diet.

Other researchers say grapes may also be potent against viruses and tumors because of their high tannin content and can assist in eliminating acid from the system.