Prophet Muhammad in His Ahadith Described the Benefits of Some Food and Drinks, bellow are few examples:

Milk:

Muhammad said that milk wipes away heat from the heart just as the finger wipes away sweat from the brow. It strengthens the back, increases the brain, augments intelligence, renews vision and drives away forgetfulness.

Honey:

Considered to be the best remedy for diarrhea when mixed in hot water. It is the food of foods, drink of drinks and drug of drugs. It is used for creating appetite, strengthening the stomach, eliminating phlegm, as a meat preservative, hair conditioner, eye salve and mouthwash. It is extremely beneficial in the morning in warm water and is also a Sunnah.

Olive oil:

Excellenent treatment for skin and hair, delays old age, treats inflammation of the stomach

Mushroom:

The Prophet said that mushroom is a good cure for the eyes; it also serves as a form of birth control and arrests paralysis.

Grapes:

The Prophet was very fond of grapes; it purifies the blood, provides vigor and health, strengthens the kidneys and clears the bowels.

Dates:

The Prophet said that a house without dates, in fact, has no food, it is also good to be eaten at the time of childbirth.

Figs:

It is a fruit from paradise and a cure for piles.

Barley:

Good for fever in a soup form

Melon:

Melon contains 1000 blessings and 1000 mercies, The Prophet said "None of your women who are pregnant and eat of water melon will fail to produce off spring who are good in countenance and good in character.

Pomegranate:

The Prophet said it cleanse you of Satan and evil aspirations for 40 days.

Can any one explain this to me, why is so? -- Omar

Water:

The Prophet said the best drink in this world and the next is Water; when you are thirsty drink it by sips and not gulps, gulping produces sickness of the liver.