Unprocessed foods are bad for people and hold back top athletic performance. Historically people decided to process foods for a good reason

There is too much fiber and animal fat in many foods

Processing can remove animal fat & fiber

Too much Fiber prevents you from eating enough nutrients

Animal Fat increases your body fat percentage without improving endurance as much as carbs

Many types of Animal fat except Omega 3 in fishes which can contain mercury tend to increase heart attack risk