No matter what current study you read now, you can almost guarantee there will be a study out at a future date saying the opposite. And then it repeats.
fat bad, fat good
carbs bad, carbs good
morning cardio bad, morning cardio good
evening workouts bad, evening workouts good
fasted workouts bad, fasted workouts good
high protein good, high protein bad
eggs bad, eggs good
omega 3 good, omega 3 bad
red meat bad, red meat good
diet soda good, diet soda bad
multivitamins good, multivitamins bad
glucosamine good, glucosamine bad
and on and on....