If someone had to choose only one thing to do for health, a healthy diet is far more important than exercise.
> and virtually no effort to simply not consume them.
I don't think this is true. The executive function required to manage the dopamine cycle that food generates is incredibly taxing. I honestly think this is a result of our food systems being incredibly optimized to drive purchasing decisions...
Separately, this reminds me that I should eat some veggies.
The ancestor comment saying to do cardio is right. Strength training is also important for health, but for different reasons (motor function, bone density, etc.). The act of strength training also burns some calories, regardless of resultant muscle mass.
Every extra kg of muscle is estimated to contribute 21kcal/day to the RMR. If you put on, say, 15kg of muscle over a few years (quite doable if you are very sedentary and have low muscle mass), that's an extra 300kcal/day. Add in 30 mins of biking a day, and say 100 cal from strength training on average, that's a good 600-700 calories per day!
In the past I've toned my training down due to exhaustion, not from the physical output but from having to constantly be shoving calories down my throat.
The big issue with diets is that people eat too much carbs, and if you aren't burning those carbs for energy, this is where problems happen. Healthy regiment of exercise will help greatly with this, giving you the option to eat tasty foods with carbs and maintain a good weight without any problems.
It gets even worse, when the obese try to outrun a bad diet they not only fail but they often injure themselves in the process.
It always pains me to see obese people out on the trails beating themselves up in an obviously misguided but respectable effort to lose weight.