The carnivore diet is ridiculous for several reasons. Firstly, it doesn’t just eliminate carbohydrates, it eliminates everything. For example, leafy green vegetables and nuts are both carbohydrate-free foods. Furthermore, we don’t have the right digestive tract to exist only on animal products, so the diet isn’t nutritionally sound
Even if one does manage to subsist off of only meat, there’s no guarantee that you’ll end up consuming fewer calories. And too many calories will prevent any and all weight loss, so the diet as is may not be effective at all.