Others use Guideline Daily Amounts - or GDAs - which give the percentage of recommended intake.

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Recommended intake for a Brit is in the 2, 300, 2, 400 calories a day range.

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But, so is the fact that the recommended intake has been raised three-fold.

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The daily recommended intake of vitamin E is about 22 international units for those 14 and older, and is relatively easy to obtain from oils such as sunflower, almonds, peanut butter, and spinach.

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The survey also showed "no significant change in the proportion of adults or children consuming the recommended daily intake of five or more portions of fruit and vegetables".

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Doctors recommend women figure out with their primary doctors how much calcium and vitamin D they are getting from food and either make adjustments to their diets or add separate supplements of both nutrients to get to recommended daily intake of each.

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Dr. Rosen served on an Institute of Medicine panel that in 2010 recommended a daily vitamin D intake of at least 600 IUs for children and adults up to age 70.

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With the help of a team of dietitians, he performed a small study on pregnant women to see if he could manipulate their diet to increase their vitamin E intake up to the recommended levels and, he says, "it worked a treat".

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Extrapolating from the mouse data, you would need to keep your calorie intake to three-quarters of the amount recommended by dieticians.

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