Psychology is a great example of a Pseudoscience. They mention Chemical inbalances but there has never been a test to prove that. Its just been indoctrinated into out society in advertisments and TV commercials that people accept it as fact. Everything a psychologist bases their diagnosis on is of a subjective nature. There is no objective test or blood test, no brain scan. Everything is subjective. They love to use the word "Soft Science"
There may be a ruptured blood vessel inside your nose. Have an appointment with the ENT to double check you don't have anything serious. :)
Athletics are in that 15%
Healthy body fat for younger men is 20%
And 25% and lower are the healthy body fat for men and women
30% and higher are obese for men and woman.
Depending on the age range I would go for the 20%- 25%.
Health experts say a number between 18.5 to 24.9 is a healthy BMI for men.