I’m going to side more with RivkahChaya on this one DSeid. You’re both right of course, and there are multiple ways to manage dieting. But, with the possible exception of dark leafy greens without toppings, if you eat too much of anything, no matter the quality of the nutrients, you will not do well if weight loss is the goal.
Diabetes, liver health, and other issues tend to focus more on the quality and balance of what you eat at least as much as portions though, so as I said, you’re both right.
That was one of the problems with almost every diet trend IMHO - they boil things down to 2-3 phrases, and people latch on those and ignore the rest of the supporting strategies. “As long as I avoid carbs, I’m fine” but eat 3-4 kilocals of meat and cheese and watch your waist expand!
“Eat a balanced diet with large portions of vegetables and fiber” while drowning the veggies in butter and cheese, and lots of healthy fruit snacks, which are modern hyper sweet versions swimming in sugar.
Yeah, diet as a whole should be examined in terms of total intake, nutritional balance, and with concern for underlying conditions, but very few people want to do that. And (back to the topic) we are terrible on the whole about estimating quantities without measuring. So we under-report to ourselves and our doctors.
I am reminded of my step-father who I mentioned earlier as a borderline (or likely over) alcoholic - he and my mother were working on losing weight many years ago, and they were at the time doing a SlimFast variant. So breakfast, lunch and snacks were tightly controlled, with a ‘sensible’ dinner being the main meal of the day. It worked fine for my mom, but step-dad had issues, he wasn’t cheating on the food, but he was still having 2-3 ‘lite’ beers a day. And boy does that add up fast!