Daniel the prophet asked for himself as well as for Hananiah, Mishael and Azariah to be tried with a vegan diet for 10 days:
“Please test your servants for ten days, giving us legumes to eat and water to drink. Then compare our appearance with that of the youths who eat of the king’s food, and do with your servants as you see fit. He agreed to this plan of theirs, and tested them for ten days. When the ten days were over, they looked better and healthier than all the youths who were eating of the king’s food. So the guard kept on removing their food, and the wine they were supposed to drink, and gave them legumes. God made all four of these young men intelligent and proficient in all writings and wisdom, and Daniel had understanding of visions and dreams of all kinds. When the time the king had set for their presentation had come, the chief officer presented them to Nebuchadnezzar. The king spoke with them, and of them none was equal to Daniel, Hananiah, Mishael and Azariah; so these entered the king’s service. Whenever the king put a question to them requiring wisdom and understanding, he found them to be ten times better than all the magicians and exorcists throughout his realm.” (ספר דניאל א)
After a lot of research, I’ve found a guide that could help you transition to a vegan diet.
The guide includes articles about healthy nutrition, recipes, meat and milk substitutions, tips on changing eating habits and all the information you would need in order to switch to a healthy vegan diet. How to eat healthy, how to get all of the essential nutrients such as iron, calcium, omega3, protein and more. How to cope with family members who are not vegan, what to do on events and family dinners, coping with various objections, handling different nutritional deficiencies and more.
It also has experienced vegans and nutritionists who will answer all of your questions for free.
The guide can be found here: http://www.vegan-guide.co.il