I still think "eat less" is bad advice, because just "eating less" chips/soda/garbage is pretty difficult. I've tried. It requires an extreme and inhuman amount of willpower. Our natural drive is to vacuum up all the easy energy in front of us.

"Eat better" is probably better/more useful vague advice. You can eat a whole lot of salad/veggies and it wont end up being that many calories (so, in this case, you're eating MORE, but consuming less energy/fewer calories). Same with meat. It's hard not to lose weight if you're eating a lot of (leaner) meat, because you feel extremely full after a couple hundred calories worth. If you start modifying your diet, your cravings will change too. It's all about these weird feedback loops.