High carb days need to be inserted into your fat loss plan regularly to prevent a metabolism stall, but high carb days cannot be taken too frequently without slowing progress. The frequency with which to take high carb days will depend on how fast your metabolism is and how lean you are. Below is the guide for determining the frequency of high carbs days based on body type.
So how many carbs should you eat on your high carb day? This is highly dependent on individual metabolism. The increase should be 55%-115% of what you consume on your typical diet. I realize that this is a pretty wide range but it can be narrowed down through body type. If you have a fast metabolism (ectomorphs) then you should stay closer to the higher end of the carb range. If you have a slow metabolism (endomorphs) then you will want to stick closer towards the low end of the carbohydrate range. Lastly, mesomorphs should stay within the mid range on their high carb days.
To avoid starvation the body will lower leptin levels and lower energy expenditure in an attempt to slow down the rate of fat loss. As stated before, leptin is a primary fat burning hormone, low levels of it will spell disaster for any fat loss plan. There is a way to keep leptin levels elevated though. This can be accomplished through controlled high carb days. High carb days will keep leptin levels high and the metabolism running efficiently.
Stand in front of the bar, shins touching metal, feet roughly shoulder-width apart. Squat down and grab the bar overhand, hands slightly wider than shoulder width and elbows straight. Draw your shoulders back, push your chest out, and tense your lats. Taking a deep breath, begin standing up, pushing heels into the ground and pulling your chest up. Keep the bar as close to your legs as possible. As soon as the bar passes your knees, push your hips forward with power, ending standing tall and straight with the bar in front of your groin. Slowly reverse the motion, making sure to keep your abs braced, and lower the bar to the floor.