I agree, to presume that when the body is getting fewer calories that it starts destroying critical organs is absurd.
First of all, the Master-Cleanse
lemonade has plenty of nutrients, its just fewer calories and has some nice detoxing effects.
Secondly, recent studies show that lowering caloric intake increases longevity.
Thirdly, not only are you getting good nutrients, but you are also cleaning your nutrient-absorbing tissues such that they may better serve you in the future.
Don't let those who are enjoying their comfortable state dissuade you from your goals.
The Master Cleanse
has proven itself safe.
Also, what is the BMI index of the person advising you about your diet?
What does their diet include?
How is their general health?
I have a hard time following the health/diet advice of anyone who does not strike me as remarkably healthy.