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The common-knowledge, human-food definition of roughage is this: "Fibrous indigestible material in vegetable foodstuffs which aids the passage of food and waste products through the gut." However, part of this definition does not hold true in terms of ruminant nutrition. The definition of roughage in ruminant nutrition is forage that is coarse and high in fibre, cellulose and lignin which promotes rumen digestion, increases chewing time, and promotes microbial activity. (In contrast to humans, roughage is not indigestible for ruminants--rather it is the food type that encourages digestive activity, and is the basis for which all diets for all ruminant animals must consist of.) Roughages include hay, silage, and tame and native grasses and forbs.
It is because their diets and digestive systems are very similar.
Nutritionsystems.com is a great website to learn about the different types of diet plans and nutritional systems. It weighs the pros and cons of all the diets to help you choose.
The prison I was in allowed diets. Like kosher diets, diets based on any allergies, etc.
There are different types of routine hospital diets depending on why a person is hospitalized. There are low sodium diets, regular diets, soft diets and liquid diets.
Fad diets
No there is not a legal age for diets.
Tigers are carnivores and deer are vegetarians - their digestive systems have to be different in structure and function because of different diets.
CAUSE DIETS ARE BAD
It is just like food diets, but with liquid.
http://www.diet-i.com/ has information on TONS of diets. It tells you what the best diets currently are, gives you reviews of diets and even has a section for special diets.
Mostly fad diets such as the Sacred Heart diet and the cabbage soup diets have been debunked. These are extreme diets that are in no way healthy or maintainable. The detox diets have also been know to not last.