To do this, Eric has what he calls the five cornerstones to any successful fat-loss program: increasing nonexercise activity thermogenesis, or NEAT (the activity you do outside of the gym), weightlifting three days a week, implementing HIIT one to two days a week, getting enough sleep (seven to eight hours a night), and eating in a healthy calorie deficit. If you're curious why hours of cardio aren't on the list, that's no accident.
"When we’re lacking in sleep, our body’s hormones get thrown off balance which can impact our hunger levels the next day. We all have two hormones that affect our appetite: ghrelin and leptin. When we don’t get enough sleep, our ghrelin levels (the hormone that makes us feel hungry) rise, and our leptin levels (the hormone that makes us feel full) drop. This means that when we’re awake, we tend to eat more but feel less satisfied. Try going to bed a little earlier than usual to avoid this imbalance and remember to remove any distractions that might prevent you from nodding off."