I'm literally starving myself atm eating just meat, potatoes, pasta and baked beans as that seems the only food which is still sold at reasonable prices without any added fat.
The hamburger seems pretty healthy to be honest. The unhealthy part is people stacking up to 5-6000 kcal per day from various unsuspecting sources, then comically blaming it on sugar and fast-food...
The other day I wanted to buy some biscuits: 24% fat. Before that I bought (first and last time) some hotdogs, while they're processed normally they're still healthy, not the ones in this country though.. 3 minutes after dropping two of them on a frying pan, I find them floating in a 1.5cm of grease that just started melting from them. Where I come from, I'd have to add some 10-15ml of sunflower oil so that my hotdogs don't stick to the pan...
Fast-food is really healthy compared to what normal people can buy in any mainstream supermarket, worst part is big name brands will usually have the most fat and sugar packed into their foods.
The real issue is sugar. The body uses or passes most fat. Sugar historically was hard to come by so the body stores it. I recently moved to the Midwest and am shocked at the addition of sugar to everything. And at the size of people.