Some carbs are very high in electrolytes. Like bananas .. potassium. Coconut water .
Low carb people need to supplement with electrolyte powders to compensate for low levels of electrolytes.
Also, very low carb leads to constipation issues. At least it did for me.
Many people gain weight because they are inactive.
You can cheat more with no carbs and not gain weight even if you're not active.
But a 0 carb diet does not appear to be optimal just based on electrolyte deficiencies and constipation issues alone. There are probably other reasons why consistently 0 or near zero carb may not be optimal.
But I'm not convinced what the optimal diet is yet. But I don't think eating only meat is optimal. But some people seem to do it for long periods of time and maybe it does work for them.
I got sick of the constipation.
Although it is more challenging to keep slim when you add some carbs. You really do need to be very active.
And speaking of carbs, I just watched one of Sten Ekberg's videos on honey. And of course, being a low carb scientific type, he was warning against excess honey. But one guy in the comments section was from Greece and claims to eat a boatload of honey and have good numbers. I don't think scientists have a complete grasp on what some of these carbs are doing in the body. Honey, for instance, appears to mystify scientists.