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I'm not a big fan of keto either. I prefer balanced macros and micros instead of any nutrition plan which is skewed. It's the safest bet as I see it to avoid any deficiencies and also probably the most psychologically sustainable for most people in the long run.
If it works for some people, great, but it's not something I would suggest to someone looking to slim down. I'm actually against any kind of generalized prescribed diet in those cases and would rather look at the individual and analyze their worst dietary habits and see if they can compromise and overcome some of the worst ones with small little baby step improvements they can sustain.