Some bible translations have tried to downplay the importance of fasting and praying in Christian life by deliberately omitting Matthew 17:21
Fasting does not kill; it can only make you physically and more importantly, spiritually, stronger.
Add fasting to righteous living, prayer and praises to the almighty God; and you will experience his abundant goodness.
“When you fast, you are bond to be hungry. You need self discipline to overcome the pangs of hunger.”
Memorise: Howbeit this kind goeth not out but by prayer and fasting. -Matthew 17:14-21