A little information is a dangerous thing. For example…
Lower intensity cardio burns a higher percentage of fat, but higher intensity will burn more total fat. Excuse: I dont do my cardio too hard because I want to be in the “fat burning zone”.
Higher rep/volume training can produce lactic acid and growth hormone, provided you are working hard enough. Excuse: I do light weight and high reps to get “toned”.
Many health food stores offer plenty of healthy choices with some unhealthy choices for variety and once-in-a-while treats. Excuse: It came from (insert health food store here)! It has to be healthy!!
Some people have a predisposition towards gaining fat (endomorphs). However, with proper diet and exercise, this can be overcome. Excuse: I cant lose weight, its genetics!
Learning what works for your body takes time and effort. Scientific studies, empirical data, etc, can help you make good choices, but in the end its really all about what works for you and what doesn’t. Excuse: Its all too confusing! Everything they say is healthy one year is unhealthy the next! Its too confusing to even try to keep up with.