I don't think of the second part being about self control and obesity, to me it's just a reinforcement of the idea that each person has different caloric requir

I don't think of the second part being about self control and obesity, to me it's just a reinforcement of the idea that each person has different caloric requirements and you should respect your own needs. Of course it's vague so open to interpretation. The third part feels as arbitrary and unfounded as any other dietary advice I read, so I'm inclined to take the simplest advice available.