If you are 150 pounds overweight you need to stop eating. Your body needs to hunker down. I have seen people do it. Much safer than surgery.
No, actually, you shouldn’t. The science is now conclusive. Training your body to consume fat/protein first is the safest way to diet.
If you stop eating, your body will respond by shutting down the metabolism.
The ONLY downsides to a keto diet is a) initially, the level of ketones in your blood will result in urinating more often and sometimes some headaches and b) making sure there is enough variety in your diet that you don’t go back to carbs.
The giant upside - no starvation.