> keto diet that's mainly leafy greens with healthy protein like salmon?

A ketogenic diet is 70% fat.

It’s literally impossible to get into keto with a diet of leafy greens and salmon. You would have to augment with a lot of fat from some other source and also limit salmon intake to avoid consuming too much protein. Salmon has too much protein and not enough fat to even come close to keto ratios.

You must be thinking of a different diet. A lot of people think keto is another word for low carb, but a real keto diet is very low carb and low protein.