Your best shot, as ever, is to eat a good mixture of grub, going for freshness and top quality. Junk food, fast food, a rare treat only. In people with no underlying medical issues, supplements are scarcely needed, if at all. There is concern about Vitamin D deficiency in winter, as good food sources are the exception. Folate is one to watch. Eat your greens and beans in abundance. What's not to like? Veganism is is a self-imposed risk. Not for me, not ever.