Blindness to costs
Evidence helps me make decisions when the cost of intervention is high and immediate. Once I make the cut, I can never take it back. There are no do-overs and the damage I personally inflict on a patient is instant. Surgery is a calculated intentional harm for the chance at a net gain. This is in contrast to exercise and nutrition where change is more gradual and where the cost of intervention is perceived (rightly or wrongly) as mostly time and this vague thing we call effort. But the immediacy of time should not be overlooked as a high cost. Perhaps therein lies the rub: fitness “professionals” fail to see the costs of their own interventions; because if you could see that high cost, you would use EVERY resource available to you to make the right decision.