This is a really broad topic and I don't know where to begin, but lots of people have different ideas on what's healthy to eat and what isn't. Carbs, calories, trans-fats, GMOs, etc. There's a lot of conflicting information. So, PCers, what's a healthy diet and what isn't?
Give into your cravings, that's step one ... as long as your cravings are not skewed by things like candy you can safely assume that craving potatoes and fat is probably something your body needs.
EVERY food we consume today is genetically modified, though many of our old methods are primitive, such as cross breeding and selective breeding, our newer methods are much safer and produce more viable organisms. There are more myths in the media about GMOs than facts, the old adage, you can't believe anything you see on television. A banana that is not genetically modified is difficult for humans to eat, more seeds than meat in it, and the genetically modified variety you buy in the stores is sterile, it cannot reproduce through it's own means. That's the most glaring example.
Carbohydrates and calories are required to survive, those are chemicals humans need for energy and cell repair. "Trans-fats" are not as bad as people make you think it is, if you consume too much of any fat it will harm you, but then you have to consume enough or risk some medical conditions that no media outlet tells you about.
But here's the trick of it all .... there is no "normal" for living organisms, and no two organisms, even of the same species, will need the same things. The generalizations of "this is bad for everyone" was bad for the species, because everyone will be different. Different chemicals will react differently in the organism, often in extreme ways, food allergies are a very good example of this. Cravings are how your body communicates what it needs to your brain, ever notice that sometimes you crave a food that you don't like? Every once in a while I crave a steak, I don't like steak, but I crave it sometimes. But you have to understand your cravings, often when you are craving candy you are not craving the actual candy but something that tastes like it ... or is in the candy that could be found in a much better form.
If you are attempting to alter your weight, that's pretty much best left to trial and error, find what works. Some of us can eat anything, literally, and as much as we want without ever gaining a pound. I have to sit idly a lot just to raise my weight by 5 pounds, but my first three mile hike and ... it's all gone. Multivitamins can help people as well, though you may find all food less appealing if you use multivitamins too regularly, just ... do whichever you prefer in that case. Some of us are ultimate carnivores, we survive on meat more than anything. Others will be herbivores, loving their vegetables. Just ... whatever you prefer ... don't try to kill people by outlawing certain food stuffs, that's just mean.