Is it good for your body to be in ketosis?

Even though a keto meal plan is very restrictive - eliminating many food groups higher in carbs, keeping calories low on a high fat diet can still be a challenge. Fat provides twice as many calories per gram than protein and carbs, so you portion sizes may actually be smaller on a keto eating plan.  In addition, it can be hard to get enough of certain nutrients commonly found in higher carb options - like vitamin D from milk and B vitamins from grains.

https://www.youtube.com/watch?v=eMvPfNHRCeY