Daniel chapter 1 diet? Daniel and his 3 mates were to eat only vegetable-based foods and they went teetotal. All 'rich' food was excluded. Daniel also said it would be defilement to eat that food which was said to be 'the best' of the king's kitchen.
Result - Daniel and the 3 friends looked healthier and better nourished than those on the king's food.
Verse 16-17 So after that they were given vegetables… God gave these four young men knowledge and understanding in every kind of literature and wisdom. Daniel also understood visions and dreams of every kind.