There are two three things wrong with milk:
1) It has sugar in it
2) the fat in it isn't always the best fat. Most milk is not grass-fed milk and is mostly saturated omega-6s. You get a better omega profile with grass milk.
3) some people don't process lactose well.
Milk doesn't really have that much sugar in it, and the fats are kind of the same story with most animal products.
So basically, if you can tolerate lactose, I'd keep it in. There is almost certainly something better to cut out if you are trying to grow muscles than milk. Milk is the reason vegetarian athletes tend to be a lot more common than vegan athletes.
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