Milk

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Unless otherwise indicated, milk means cow's milk. Fresh (pasteurised) milk should be kept in the fridge and consumed quickly. Longlife (sterilised or UHT) milk can be kept unopened for 150 days at an ambient temperature. Semi-skimmed milk is the most common, but whole and skimmed milk are also available. It can also be found in powdered or concentrated form. We're also seeing more and more organic milk and milk with added vitamins and nutrients (for pregnant women for example). Goat's milk and ewe's milk are also available, and their nutritional value is almost identical to cow's milk. 
The benefits: 100ml of semi-skimmed milk contains 46 Kcal, 3.2g protein, 4.6g carbohydrates, 1.6g fat, 120mg calcium and 18.3mg Vitamin A. (100ml skimmed milk contains 0.1g fat and 34 Kcal; 100ml whole milk contains 3.5g fat and 65 Kcal).
Intake: Skimming doesn't change milk's protein or calcium content, so you're better off going for skimmed or semi-skimmed milk which contain fewer calories. The only difference is in the calories, fatty acids and vitamins. If you have trouble digesting milk, avoid drinking it on an empty stomach or in large quantities at once, and drink it with other foods.