Nearly 75% of people do not possess the necessary enzymes to digest dairy. Additionally, dairy contains lactose, which is a sugar that can impact ketosis and should be limited to optimize ketosis.
Cheese also contains casein, a protein that can further drive inflammation and may even contribute to mood disorders.
Not everyone needs to avoid dairy but most should limit it. If you notice fatigue, bloating, digestive problems, or weight loss stall, dairy may be the problem and cutting it can make a big difference.
Furthermore, all of the beneficial nutrients found in dairy can be found in other Keto-Friendly sources removing any need to consume dairy.