Exercise does nothing for weight loss if you're eating too much. Exercise has health benefits, but weight loss is not one of them for the vast majority of people. People wildly overestimate how many calories they're burning.
> People wildly overestimate how many calories they're burning.
And people wildly underestimate how many calories they need. Just by limiting the one portion to 50g of pasta, instead of my preferred 150+g, I can go under 100kg in less than a week. My 'how much should I cook' habits formed when I was young and spent at least a couple of hours commuting, but nowadays I'm quite literally just sit on my ass all day. It's bothersome and isn't fulfilling to use scales cut down on the food (especially if it's tasty) but...
Exercise can help control hunger and insulin levels so it's a good idea to pair moderate exercise with diet. I find it harder to resist snacking when I'm not regularly exercising.
Calories can still be a useful metric as a proxy but low calorie (“diet”) foods tend to compensate with more carbs. At least the ones I see regularly at my grocery store.
As a side note: It’s actually difficult to find pre-packaged low carb food at regular grocery stores sadly. It requires effort to make yourself, just like going to the gym. Like most good things in life.