A 500 calorie per day reduction will result in a loss of approximately one pound per week. So, losing 40 pounds will take 20 weeks, or about 5 months at 2lbs per week. If you decrease Keto Blast your daily intake by 500 calories per day as well as increase your energy expenditure by an average of 500 calories per day. From our example above, to lose 2 lbs per week, they would either need to eat 1730 calories per day (2730-1000) or 2230 calories with about 500 calories worth of exercise averaged out over each day.