In Yoga, it is said that `What you eat is what you are.' Meaning the food has a  direct impact on human mind, personality and behavior. After all Yoga is  basically a healthy life style for spiritual upliftment!
The Science of Yoga has both, ideology and technology: suggestive theory  and practical methods. Yoga suggests and supports vegetarian diet, naturall
y  grown fruits and vegetables, all grains, pulses and dairy products as a healthy  diet with few options. The options are available to those who have reached the  higher level of understanding and perception. The yogic diet emphasis vegetarian  and dairy products for mainly two reasons, firstly: The principles of Yoga are  based on the laws of the Mother Nature and secondly it purely believes in the  core nature. The more you are close to the nature you are more healthy, the more  you are away from her you are more sick and ill and most unhealthy!  
The first step in Yoga practices is *Yama, meaning restrains. Which  covers the concept of *'Ahinsa' meaning non-violence, non-hurting, non-killing  and non-injury. Mother nature has given supremacy to man by giving and providing  more intellectual power compare to other creatures on earth. The virtue of  Non-violence is to curb that power. Man has no right to kill or hurt any other  creatures. Yoga practice thus restricts the act of man so he can't misuse his  powers on other creatures. In other words there is a straight message to eat  live and survive on the products naturally grown or cultivated by man in order  to cover the needs of the human population on earth.  
There is always a debate and discussion that plucking and cutting any  fruits, vegetables, plants and trees, is also an act of violence. Yoga gives  further explanation that you have only right to cut, which, is grown naturally  or cultivated by man himself! The seed itself has no life. You put life into it  by providing land, manure, water, your efforts and care. So you have a right to  pluck and cut! You are the cause and reason of that life. So for survival,  cutting any naturally grown and cultivated plants or plucking fruits from a tree  is not considered as an act of violence or sin as per the law of nature and  Yoga.  
Yoga science further explains that why vegetarian diet is good? It also  gives scientific explanation at both levels: physical and mental.  
Physically:  
Vegetarian diet is easy to digest because it is natural E.g. The protein  from any beans or dairy product is easy to digest than an animal protein.  
Vegetarian diet takes 3-4 hours to digest while non-vegetarian diet takes  6 + hours to digest. The body and specially the organs of the digestive system  have to work more and hard to digest heavy foods.  
Mentally:  
Our great Yogis were observers of the nature. They have studied the  Nature very minutely and precisely. Milk is the first food taken by all babies:  human or animal! A very natural form of food for any life! Produced by the body  and for the nourishment of the body! So all the natural form of dairy product is  covered in Yogic diet. Again animal milk is a question of debate and discussion  but we all know that we use the milk from animals those are domestic and survive  on grains, grass and plants - the natural foods. E.g. cows, goats, camels etc.  Plus the priority is given to their babies and human - the caretaker or owner,  uses remaining extra milk!  
In the category of domestic animals we have to consider elephant, horse,  donkey, bull etc though they are strong, their strength and power is useful,  they offer their services to the owners! The violent and wild animals: tiger,  panther, lion, they attack and kill others. Now just compare their nature,  behavior and food they eat and you will get the answer!  
In other words it proves that even in animal kingdom, those who are  eating natural veggie food are more calm, useful and stronger animals! Their  strength is useful. While wild animals are always angry, irritated, agitated and  restless. They are strong but the strength is wasted in fulfilling their needs,  instincts, power and desires!  
The same principle applies to man! Here we get the straight message from  the nature that which type of person you would like to be? Calm, cool controlled  and at ease or angry, agitated and restless? As I've mentioned earlier that in  Yoga it is said `what you eat is what you are!' I hope that the explanation  given by our great Yogis is enough to understand that why Yoga practically  suggests, supports and encourage vegetarian diet! Choice is your! To eat  vegetarian diet or non-vegetarian!  
Note: Words written in *Italics are Sanskrit words.
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