Prevalence of vitamin A deficiency. Vitamin A deficiency (VAD) is a lack of vitamin A in humans. It is common in poorer countries but rarely seen in more developed countries. Nyctalopia (night blindness) is one of the first signs of VAD.revalence of vitamin A deficiency. Vitamin A deficiency (VAD) is a lack of vitamin A in humans. It is common in poorer countries but rarely seen in more developed countries. Nyctalopia (night blindness) is one of the first signs of VAD.
Both lithium and valproate have been reported to increase rat CSF GABA levels. Regarding valproate, animal studies reported that it enhances GABA levels, GABA synaptic release, GAD activity, neuronal GABA responsiveness, and inhibits GABA-T in several brain regions.
An example of an inhibitory neurotransmitter is GABA, which reduces energy levels and calms everything down. Drugs like Xanax and Valium (and other benzodiazopenes) increase GABA production in the brain, resulting in sedation. Alcohol does the same thing by increasing the effects of GABA. This, by the way, is one reason you donât want to drink alcohol while taking benzodiazopenes; the effects will be amplified, and that can slow your heart rate and respiratory system down to dangerous levels.