Originally Answered: Why does it seem that most healthy foods are less tastier then other fattening unhealthy foods?
This is a myth. Some of the tastiest foods can be healthiest. Things like chicken breast, london broil (beef), pork tenderloin, carrots, apples, pears, and beans are among the tasty, healthy things out there. It takes some time to adjust to them though, because our heavily processed lives have us convinced that heavily-processed, unhealthy foods taste better.
Also, fattening foods, when they have a lot of fat, salt, and sugar, tend to be addictive. Fat gives food a great texture, what food scientists call "mouth feel" and makes other foods more palatable. (You can use this to your advantage by cooking your veggies in a little olive oil.)
Sugar isn't addictive, per se, but it doesn't have addictive properties. Like illicit drugs, sugar activitates the "pleasure" centers in your brain. It gives you a quick boost. Over time, your brain says "more please!"
Salt is also tasty to human beings, partly because we need it to regulate our heartbeat. Of course, we don't need that much, no more than 500 mg. a day, 1200 mg. if you're really active, but the body will still take a lot of it in. However, cravings for salt do have some physiological basis and are often seen in those with adrenal disorders or low blood pressure.
Note that pizza can be healthy, on occasion. Skip the toppings unless they're vegetables and blot any extra oil off with a napkin. You can have two medium slices, three really small slices, or one big slice.
Ice cream can also be healthful, but most of us overdo it. First, get the low-fat or even fat-free kind. These types will take some getting used to, but afterwards, you won't know the difference, since manufacturers have learned how to make their ice creams creamier and richer. And then remember a serving size is a half-cup. That doesn't seem like a lot, but put it in a really small bowl and it will seem like plenty. You may have to adjust to that amount though!
Burgers, however, really should be taken in moderation. Make them yourself with the leanest ground beef you can get, use whole wheat buns, pile on the vegetables, such as romaine lettuce, tomato, and onion, and use ketchup and mayo sparingly.