Yes, the 40-day Protocol (also called the 43-day protocol) was developed by Dr. ATW Simeons. Then why the variations?
Because no two bodies are the same and not many can withstand to continue the low calorie diet for so long. That’s one main reason why this variation has come out.
Another reason is that hcg diet tends to have few side effects and many dieters would like to give it a try before jumping the hcg bandwagon. Hence, there are trial hcg diet program such as for 7 days that will help them to understand how hcg works.
Thirdly, not many need to lose heavy pounds. If there is a forthcoming wedding or a party, people want to lose less than 10-15 lbs and the 40 day program might be just too much for them.
That’s why such variations. Hope it helps answer your queries. 🙂