For
Some people need fast results for motivation or health.
Against
Crash diets can harm the body and rarely last.
Anonymous excerpts, translated where noted.
“I did it for about two months and lost quite a lot too.”
“My first two months were practically around 20 kg.”
“Laypeople doing this risk injury and health problems due to low energy.”
“This may make you lose weight very quickly, but it will be very easy to abandon the diet.”