I think it would be a deficiency is a vitamin or mineral. Increase the relevant vitamin or mineral to optimum levels.
diabetess
It depends on which vitamins are not eaten. For example, a deficiency of vitamin C will cause a disease called scurvy, while a deficiency of vitamin E can cause severe neurological damage.
iron deficiency
Pellagra is a Vitamin B3 (Niacin) deficiency disease. It is caused by severe and prolonged deficiency of Vitamin B3. Symptoms are bilateral dermatitis, dementia, and diarrhea. A prolonged and severe niacin deficiency may cause depression and neurasthenia (weakening of muscles).A deficiency in Vitamin B3 can cause depression, memory loss, canker sores and fatigue.
Peripheral neuropathy is a disease of the nerves, which may cause parenthesis, numbness and tingling, weakness and/or burning sensations. Among some of the causes is diabetes, vitamin deficiency, shingles or many immune compromising diseases. Treatment for peripheral neuropathy may include medication, diabetes control and vitamins to avoid deficiency.
The goal of treatment is to identify and correct the cause of the imbalance. Oral magnesium supplements or injections are usually prescribed to correct mild magnesium deficiency. If the deficiency is more severe or does not respond.
Vitamin B
It depends on the cause of the skin disease? See a vet for advice and treatment.
Disease called Beribery will cause due to deficiency of vita. b.
Iodine deficiency is the most common cause of hypothyroidism worldwide.
Refsum's disease is caused by a deficiency of phytanic acid hydroxylase, an enzyme that breaks down a fatty acid called phytanic acid.
Calcium deficiency can lead to a number of diseases and disorders, including osteoporosis, rickets, osteomalacia, hypocalcemia, and dental caries. In children, calcium deficiency can cause stunted growth, soft bones, and weakened teeth. In adults, calcium deficiency can cause bone and muscle weakness, nerve problems, and fatigue.