Fermion
Title says Quercus, but emojis say Castanea.
Fructose in particular causes liver damage at a much higher rate than other carbohydrates including glucose. It’s not as simple as excess calories.
There are more non-obese diabetics than obese diabetics. Yes, there’s a strong correlation between weight and diabetes, but that has more to do with metabolic disorders causing both weight gain and insulin resistance.
If you’d like to watch a presentation on the topic, this one by Robert Lustig is pretty good. www.youtube.com/watch?v=kDJsxw0uMLM
Avoiding gluten, dairy, or sugar really requires getting proficient at preparing all your meals from scratch. It’s a good skillset to develop, but there’s major hurdles. What are the chances that every single day you’re going to have the time and energy to cook 2 meals from raw ingredients instead of grabbing a box/freezer meal or takeout? It’s not a pure question of whether someone has the willpower to say no to a craving, they have to have the discipline to plan and prepare meals before they are hungry.
Absolute adherence to dietary restrictions is very difficult even when addiction isn’t a major component.