Shelby,you can see below there is a huge difference in the fat content per 100ml, between whole and semi-skimmed milk. Cow milk is unique in that the absorption of calcium from it is superior to other sources of calcium, also full fat milk is best because of its concentrated source of calories.
Milk is available as whole milk, semi-skimmed milk or skimmed milk. The fat content of these varies:
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Whole milk contains 3.9g fat per 100ml,
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Semi-skimmed milk provides 1.7g fat per 100ml
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Skimmed milk provides 0.2g fat per 100ml
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1% milk, a blend of skimmed and semi-skimmed milk has recently become available and contains 1g fat/100ml or less.