OXYGEN throughout our body. MAJOR deficiency diseases that OCCUR due to lack of ESSENTIAL vitamins:VitaminDiseaseANight blindnessB1Beri-beriB12AnaemiaCScurvyDRicketsKExcessive bleeding from woundsNight Blindness:Vitamin A (retinol) deficiency can LEAD to night blindness.High blood pressure:Excess of sodium in the diet can lead to High blood pressure.Diabetes:Deficiency of insulin can lead to diabetes.