Whey isolate is higher in protein and lower in fat than standard whey powders, but does that mean it's better for muscle repair? We asked two expert dietitians. Make Yahoo Your Homepage.

Whey protein is isolated from whey, a milky by-product left over during the cheesemaking process. Because it comes from milk, most whey protein powder contains the milk sugar lactose.

Whole food protein sources will add other nutrients to your diet that a protein isolate will not. For example, eating chicken gives you protein as well as vitamin B12 , zinc and iron .

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