Intermittent Fasting or IF, don't start until you've seen this video.

IF or Intermittent Fasting is fasting intermittently
The principle of IF is that during the period we fast, our body will produce less Hormone Insulin, leading to less fat accumulation in our bodies. Continuing this for a long time will result in weight loss. Another thing during the period we Fasting, our body will produce Growth Hormone and Norepinephrine, both of these hormones help in burning energy and burning excess fat, resulting in weight loss without losing muscle mass