Cut out fast food, sweets, etc. and pick up running and you're pretty much guaranteed to lose weight, no further thinking required.
I disagree somewhat. There was a scientist who ate nothing but Twinkies (and took vitamins not to ruin his health) and he lost weight. At the end of the day, weight loss is in fact using more calories than one consumes. NOW, when you reduce your calories, you do want to eat good food to maintain your health, and you want to take in good amounts of protein and fat so as not to lose muscle mass ... so I don't recommend the Twinkie diet. When I cut my calories some time ago, I always avoided WASTING calories on something useless like pop or a candy bar. For what this pop has in it, I could eat a small hamburger, I thought. But you could cut out sweets and fast food and still consume more calories than you use and GAIN weight. Now, running (or any exercise for those who for some reason can't run) increases your calorie rate and your metabolism in general so that you can eat the same and still lose weight.
But I agree with the guy in the video above. You need to figure out your BMR and not drop below the BMR. Otherwise, weight loss is not sustainable.
Intermittent fasting is also great, because it keeps your insulin levels in check so that the body becomes less likely to store excess calories as fat.
So if one combined intermittent fasting with watching calorie intake, adding some exercise and eating healthy foods with plenty of protein and good fats, that's a great recipe fo sustainable weight loss.