> lettuce is a carb The typical advice I've seen is to limit 'net carbs' which is the difference between the total carbohydrates and 'dietary fiber'. Also, a

> lettuce is a carb The typical advice I've seen is to limit 'net carbs' which is the difference between the total carbohydrates and 'dietary fiber'. Also, a serving of lettuce contains a very small amount of carbs, e.g. 1.2 g per cup for butterhead lettuce. Low carb diets seem to usually consist of less than 50 g of 'net carbs' per day so eating even lots of lettuce seems entirely compatible with them. Overall tho, nutrition just seems like an inherently 'causally dense' subject, i.e. there are lots of seemingly plausible explanations for any phenomenon. Maybe there is no one simple explanation for everyone everywhere, in general.