However, no two people are alike and what is a problem for others may not be a problem for you. What works for you is all that matters, so you can try any modification of Fast-5 you wish. If your modification works, you keep losing weight. If it doesn’t, you stop losing weight. You can always go back to what worked, and all you risk by trying something new is your rate of weight loss. Once you’re started on Fast-5 using the traditional style (no calorie intake during the fasting period) and see some steady weight loss, you know what works. After that, you can experiment and see what modifications work for you.