What is causing my shaky hands and legs?

I have a light shaking in my hands and legs that comes and goes. i believe that it has something to do with my nutrition. i am eating to get my energy up and all it seems to do is slow me down even more (more shaky). what can be done to tell if i have a case of malnutrition or something else? if it makes any difference, i just dealt with a series of anxiety attacks over the last few months and they've stopped. but it feels like this can be some type of anxiety as well. any help would be greatly appreciated.