It's possible. I don't know. I eat when I'm hungry, which is quite regularly (once per 3-4 hours, maybe 5), so I'm definitely not starving myself. And if I try to eat more, I feel unpleasantly full, and I feel less hungry later - so I don't think it makes a difference.
I'm not sure how to check whether I'm eating enough save for counting calories (which seems complicated and unreliable).
I'm hoping I'll gain some muscle mass by exercise, both for its own sake and because weight gain by other means doesn't seem to be working for me (I suspect I naturally have a slim build).
At this point, I'd say it's unlikely that you're eating so little as to lower your temperature.
If you still want to test the hypothesis without counting calories, you could try a higher fat diet and see what happens.
Does your temperature ever get higher or lower?
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