In another authentic Hadith, the Prophet, peace and blessings be upon him, is also quoted to have said: “The food of one person will be sufficient for two, and the food of two people will be sufficient for four, and the food of four will be sufficient for eight.”
Healthy nutrition also means a diet balanced in its contents. This means that it must have a mixture of the different types of food, which Allah has graciously provided for His Creation, in the sense that it satisfies all the body needs in terms of proteins, fat, carbohydrates, salts and vitamins. Most of these are mentioned in the Qur’an. For example, Allah Almighty says, “He created cattle which give you warmth, benefits and food to eat...” (An-Nahl: 5)
He Almighty also says, “It is He who subdued the seas, from which you eat fresh fish…” (An-Nahl: l4)
Referring to vegetarian food Allah says: “It is He who sends down water from the sky with which He brings up corn, olives, dates and grapes and other fruit.” (An-Nah: l16)
Milk and honey are also mentioned: “In cattle too you have a worthy lesson. We give you to drink of that which is in their bellies, between the chyle and the blood: pure milk, a pleasant beverage for those who drink it.” (An-Nahl: 66)
He Almighty also says: “From within their (i.e. the bees) bellies comes forth a fluid of many hues, that provides people with a cure (of illnesses)” (An-Nahl: 69)
Islam prefers wholesome food. An example is the Prophet’s preference for wholemeal bread, dates, honey and milk. He, peace and blessings be upon him, used to drink milk and eat dates.
Washing one's Hands before Eating is a Basic Principle.
It ensures the cleanliness of the food we handle, to avoid contamination. This protects the stomach from infections. In a Hadith, the Prophet's wife mentions that “the Prophet, peace and blessings be upon him, used to wash his hands before eating.”
Cleanliness of Food and Drink
Another health rule stresses the need to ensure the cleanliness of food and drink. Islam urges that food should be covered so that nothing falls in it. A Hadith includes the instruction: “Cover your water container.” In another version, “Cover your food and drink.”
May Allah guide you to the straight path, and guide you to that which pleases Him, Amen.
Allah ALmighty knows best.
Text sourced from: http://www.onislam.net/english/index.php