Low carb doesn't mean you can't eat food with carbs, it means most of your diet is protein and fat, and you restrict carbohydrate consumption. He can have a low carbohydrate diet while eating vegetables, as long as he eats less vegetables than meat.

He said he eats no carbs.

Yes but 'no carbs' doesn't mean 'low carb'.

We've ruined multiple generations by not explaining that our bodies don't care that much about what form our nutrients take. Getting the meat sweats from an Italian sub doesn't mean it was unhealthy, it's just your body's reaction to processing it which can be a desirable feeling (say on Thanksgiving) or not.

People who switch to "healthy" and feel better pretty much fall into three categories.

* Their new diet is less enjoyable and they simply eat less and burning fat feels good.

* They accidentally switched to a FODMAP diet and associate the lack of "reaction" from food as a sign of health.

* They have been criminally deprived of fiber and are now regular for the first time in recent memory.

Non-starch vegetable have almost no carbs and almost no calories.

But they have the fiber and other green goodness you need.

Betting here that "no carbs" = no bread or other grain products.