After cardio your glycogen stores are a bit depleted. Whey stimulates an insulin response. Normally, hepatic glucose will rise to protect against hypoglycemia but post workout this may not easily be the case. Your blood sugar drops from the insulin released following consumption of the whey, and you thus feel tired. You may also feel hungry.
for the most part, you're right. Protein shakes are still just protein; it's still food.
Not by very much.
Yep
also true
Why not? Whey is loaded with glutamine and glutamine is very helpful for gut health.
Again, food is food. If you eat more food than you need (whey is food) you'll gain weight. If you do this and lift weights regularly, much of this gained weight will be muscle.
Maybe you mean something else?
Whey's a pretty cheap source of protein. I pay $40 for 2000g of whey protein, which works out to 2 cents a gram. A fifty gram serving of whey costs me a buck. I'd need to consume 7 ounces of chicken breast or lean steak to get this much protein. Last time I checked, both chicken breast and sirloin cost a bit more than 2 bucks a pound.
My .02




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