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No more than 2,400 mg a day.
As much as non-vegetarians. :) This page from the Vegetarian Society will tell you exact milligrams per day requirements for people of various ages: http://www.vegsoc.org/info/iron.html#requ The same page also says that chick peas and spinach are good sources of iron, and that vegetarians are no more likely to be anaemic. It's really important to get enough vitamin C as it helps with non-meaty iron absorption. Daily vitamin B12 is also really important, and if you're feeling weak it really helps to take it regularly. I don't know, but I am a vegetarian and I eat lots of nuts and tofu. I think soy products will help too.
unlike protein or fat, carbohydrates don`t have a R.D.I.
45 milligrams
Spinach is good because it has iron which is in beef, and pretty much dairy products and any green vegetable.
A serving of liverwurst has 16 mg of iron. The male Daily Recommend Intake (DRI) is 8mg/day The female Daily Recommend Intake (DRI) is 18 mg/day
Under no circumstances should water be rationed or limited. Let your teenager have as much water as they like.
A vegetarian should get 2-4 servings of dairy a day, just like a non-vegetarian should.
Yes, different breakfast cereals can contain varying amounts of iron. Some cereals are fortified with iron to help meet daily nutritional needs, while others may not contain as much iron. It's important to check the nutrition labels to see how much iron is in a specific cereal.
The title can be as simple as "Why vegetarian diet is unhealthy". However, I personally don't think they are. A vegetarian can get a very balanced food daily and its a myth that non-vegetarian food is essential or better. I am myself a Vegan for more than 10 years and I know such people who are so for more than 30 years. All of us are very healthy, much better than most of the people around!
About 250g per day. Make sure they are complex carbohydrates found in whole foods. Limit your intake of simple carbohydrates like sugar.