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Fat Deficiency Disease

There are total 06 categories of nutrients found in our foods are the carbohydrates, lipids, proteins, vitamins, minerals, and water. 
Out of these nutrients carbohydrates, lipids, and proteins are main ingredients of the diet. 

These constituents not only provide energy and materials for tissue building, tissue cell maintenance, but also take care of all kinds of physiological and metabolic activities. 
The lipids or mostly the fat provide needed energy and prevent essential fatty acid deficiency.

Fat can also absorb the fat soluble vitamins A, S, E, K, and prevent deficiencies of them. 
It provides flavour and the texture to the food na dmake it more attractive and less dry so that the food stays in the stomach for longer period which gives a better fulsome feeling or satisfaction, complete breakdown of the particles and help in resisting hunger right after meals.
Fat also help in providing insulation right under the skin layer and help us from the severe cold or even heat.
It provides support for organs and protects organs and bones from shock. 

Example of edible animal fats are lard, fish oil, whale blubber and butter/ghee  whereas plant fat obtained from  milk, peanut, sunflower, sesame, coconut, soya bean,  and olive oils, and cocoa butter.  
The deficiency of fat in human body causes dry, hair loss,  scaly skin, and loss of menstruation, cold intolerance, power resistance to infection, and bruising, poor growth, poor wound healing and low body weight.
Healthy diet must contain a certain amount of fat otherwise it can be responsible for many disorders. 
As many vitamins and antioxidants are fat soluble, therefore deficiency of fat affects the level and activity of vitamins and can impact whole body. 
The deficiency of fat and cholesterol can cause depression and suicide as fat involve in many biological process for the synthesis of different hormones and neurotransmitters in body.  
Most of the part of brain is composed of fat and a deficiency in fats may alter many brain functions.  

For example; omega-3 fats known as docosahexaenoic acid and eicosapentaenoic acid are sourced mainly from fish and are required for  good functioning of brain signals. 
The absence of these types of fats could result in difficulty of concentration and practice. 
The low concentration of fat in body can causes high carb content i.e. if our diet is lacking in fat, this deficiency probably means that we are consuming excess carbohydrates foods. 
If we are sensitive to carbs, we may turn up gaining weight and also on the long run develop the tendency of insulin resistance along with metabolism syndrome. 
Eating lesser carbs and more fats can help our body would function better by resisting weight gain, insulin sensitivity improvment and also decrease the risk of type -2 diabetes suffering or eventual heart problems.
Low fat level also caused depression due to serotonin dysfunction which is a neurotransmitter in the brain and contributes to feelings of calmness and well-being.