The thing is, while most people probably eat excessive calories in general the people who are in caloric deficit need to be aggressive about protein intake or muscle loss will occur. Muscle is very hard to gain and very easy to lose as you age.
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Show me a person nowadays with a caloric deficit in their diet.
Anyone who has a body fat under 12% is likely in a caloric deficit to have such low body fat or on steroids. There are plenty of people who also have eating disorders or food sensitivities.