I have mixed feelings about this line of argument. Both sides are technically correct.
- If you burn more calories than you take in you will lose weight no matter what the source of those calories are.
- psychological, what you eat will make it easier to maintain a calorie balance and that varies based on the individual.
For me, I ate like crap from the time I was 25-35 but maintained a healthy weight and a decent physique as a part time fitness instructor who worked out 12 times a week.
I like working out so it doesn’t take discipline to work out and my wife will work out with me occasionally but she prefers going to the gym and taking classes.
I stopped working out consistently for five years and my weight ballooned.
I then tried to eat better but I couldn’t get the level of discipline necessary to lose weight.
Then we moved into a house, I converted a room into a home gym and started exercising for 2 hours a day 3-4 times a week that burned about 1500 calories per workout. I got back down to my fitness instructor weight and size in 7 months. I also had to make it point not to eat more to compensate, and only “cheat” on the weekend.
All that being said, when I was teaching and even now I tell people that they can’t exercise thier way to weight loss. Most people don’t have the stamina, the discipline, or the time to work out enough to burn 4000-5000 calories a week and maintain a calorie balance.