That’s because it theoretically causes a mild ketosis (yep, the basis of the keto diet), which is a fat-burning state that should make you feel less hungry. The key in being successful with a low-carb diet (especially if you’re used to a more high-carb lifestyle) is to compensate for those lost carbs with protein-rich foods, says Dr. Cheskin. That way, your volume of food stays the same, but you’re doing it healthfully rather than in a way that exacerbates your weight gain.
When you go on a "program" to lose body fat, you may set yourself up for failure. A program implies an end point, which is when most people return to their previous habits. If you want to lose fat and keep it off, make changes that you can live with indefinitely. Don't over-restrict calories, and find an exercise program that adequately challenges you, provides progression, and offers sufficient variety so that you can maintain it for years to come.
What does a HIIT workout look like? You could jog for two minutes, sprint for one minute, jog for two minutes, sprint for one minute. Or you could do a HIIT workout on a bike, or by running up stairs and then jogging back down. The key is that you go relatively all out for a short period of time, then recover by maintaining a moderate level of intensity, then go again.