Can 6 weeks of crash dieting cause vitamin deficiencies ? I lost 10kilos in this time. Went from 86kilos to 76kilos, I am 165cma tall. Symptoms started surfacing 4 to 6 weeks later including mild cheilitis, hair loss, easy bruising, tingling near the elbows, and mild shivering of hands. I was also exercising extensively - 1hour a day and continuing my smoking habit. I've resumed a regular diet rich in protein and have gradually come back to 80kilos in 3months. The symptoms have receded as well. Just wanted to know if the diet could have been the only reason.