There seems to be two major camps when it comes to weight loss: this confused thinking of lowering fats to lose weight (as you mention), and conversely, CICO (c

There seems to be two major camps when it comes to weight loss: this confused thinking of lowering fats to lose weight (as you mention), and conversely, CICO (calories-in, calories-out). In Western diets, it is all too easy to binge on processed carbs. For people struggling to manage weight, that is usually the main issue. Diets such as Keto or Paleo tend to restrict processed foods which make it hard or nearly impossible to consume processed carbs. Restrictions from these diets naturally lead to CICO. The body only cares to consume so much whole foods -- you can eat a very large quantity of vegetables before hitting an equivalent amount of calories from processed foods (like potato chips, etc). These diets are essentially an "easy" framework (easy conceptually, challenging in practice for some due to cravings) for following CICO and reducing calories.