I've always naturally had issues with maintaining a "qualitative" body temp. Measuring with a thermometer, I'm fine. However, I've always gotten cold hands/feet. When I eat for the first time after waking, though, my body temp goes up within an hour or so. I'm also not completely recovered from my use of a pharmaceutical, so don't know how much of an effect that may be having. I know that it has likely compromised thyroid function. But, to answer your question, I don't really have body temp issues as long as I eat enough.Genuinely curious, are you able to keep up your body temperature and energy/vigour with only raw fruits and veggies, sprouts etc? Do you live in a cold or warm climate?
I actually think fruitarianism is very unhealthy long-term. I don't eat a lot of fruit. I try to keep it on the lower end of intake, focusing more on the carbs you get from microgreens and taking in more protein. Eating too much sugar is a good way to accelerate aging.but in the long run (months to years) most will run into problems due to the lack of deep nourishment from animal products, see long-term fruitarians.