Best way to gain weight is to diet. I was always a healthy weight and ate whatever I wanted until I started dieting.
Restrict food or calories and your body switches to famine mode and stores whatever it gets. Eventually the diet will end and you are still in famine mode. You gain whatever you lost plus more.

Instead of restricting your food intake, send the signal to the body that everything it needs is plentiful by eating more real food- fruits and veggies. Only after that allow yourself to eat what you want.

You will find that your body will start dropping weight and you will no longer want those less than healthy foods. The cravings for junk food will disappear.

No willpower or diet required.

As long as you are not getting the nutrients your body needs from the proper foods, it will keep telling you to eat.

Ever wonder why you can eat a whole bag of chips and still want more food soon after? It’s basically taking the chips and storing them as fat because it doesn’t know what to use them for and saying, “we still need nutrients! Eat some real food!”

If the body is especially malnourished it will cry out for carbs -high sugar foods for energy. With today’s eating habits we mistake this craving for baked goods (bread, pasta, cookies, cake etc) but what it’s really asking for is fruit!

So…
Don’t diet.
Don’t restrict.
Add more real food.
The cravings will go away.
You will naturally prefer healthier food.
The extra weight will melt away.

:-)