I’ve been doing keto (lazy nowadays, I guesstimate carbs of meals and try to stay under 20g a day) for 8 years, health and energy levels improved (in addition to losing 30kg, but that was front-loaded in the first year). But that’s probably the side effect of being far more aware of what I’m eating, I’m almost 100% positive that I eat far more veggies than before, my diet wasn’t the healthiest.