It's widely encouraged that such a lifestyle is beneficial if you are migratory. Like Nomads of long ago and the birds, when the sun and growing season move south so did they. Vitamin D is synthesized by our body through the absorbtion of sunlight. Excess Vitamin D is stored in our fat cells. When winter and or stress hits and your body starts using this stored fat for energy the vitamin D is released.
Vitamin D helps in the absorbtion of all the other vitamins.
Guaranteed your body has amazing adaption abilities like in vegans where it requires much less Zinc but not here. Vitamin B-12 is another that's not found readily in the vegetable world. This helps aid digestion. There is not a sufficient amount of research done on the affects of Vitamin B-12 defficiency in vegetarians. It is known that your golden years in life are hampered by poor digestion if your vitamin b-12 stores are not sufficiently boosted around your thirties.