The lactose and protein in dairy could be keeping you from losing weight. Dairy products contain varying amounts of lactose (the milk sugar), which slows down weight loss. What’s more, part of the protein in milk generates a significant insulin response, which can have the same effect.
Milk is originally for babies and this growth signal is perfect for them. For adults, it may just result in horizontal growth instead. And cutting back on dairy products can result in weight loss.
Definitely avoid all low-fat dairy products. They just tend to accentuate the potential problem. As the satiety effect of the fat is removed, people easily consume more of it instead.
Protein powder is pure milk protein. It may be helpful for building slightly more muscles, but people build their midsections at the same time.
Exempt from all these dairy-product warnings is butter, which is almost pure fat. Butter may be consumed liberally whenever hungry.