Sure, for maintaining weight, it does not matter where the calories come from. Keep in mind though, your body needs protein, cholesterol, and vitamins to function. Thats why a balanced diet is the best.
For weightlifters, it isn't the calories you need, as somebody mentioned above, it is the protein. Proteins are the building block and are full of amino acids that your body needs as well. Good sources of protein for shakes are whey protein. My favorite source is boneless, skinless chicken breasts. Grill the chicken, tastes wonderful, almost no fat, and full of nice protein.
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Brian Griffin: Ah, if my memory serves me, this is the physics department.
Chris Griffin: That would explain all the gravity.
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