in your words, what those it mean to be veg?
the meaning of veg is related to Ahimsa and spiritual science for mantain the nature .

Why did you choose  to be veg? have you been veg all your life?

i choose veg because  of we know behind of non veg ….yes i try my best eat all life only veg pure veg and try to not eat even onion and garlic.

can you imagine a life eating meat?

i image many things between two life.

Which are the  reasons Hindus are veg?

reason is concern with Vedas and ancient spiritual message .

How many people is vegetarian in India? in some areas people eat meat?

Krishna says one day what is old its became gold and its rising again    it means today yera  is change but few people try to follow the messages from Shiva and Vishnu
today more than 70% people is non veg but they know after non veg and that one message is working properly for them .

Why Hindus think that the cow is a sacred animal based in scientific facts?

if want to know you must read Bhagvatgita and Ramayana also you try to make the question in meditation if you are mother and you feed proper food all the time for all human and animal than why they kill mother of perfect food provider and spiritual organ .

In India, the people usually eat products that come from the cow, like milk or butter? Why?

its concern with spiritual science like we think our body, the body, needs positive energy then its perfect to come from cow  .
you can try to come India and stay in some village like two month or three month and see that the people take care of cow as well as our family god.

Do you eat eggs?

No, never, not even in cake,  we use some different product replace of egg in  cake.

Can you tell me the relationship between veg and spiritual knowledge?

Inlakesh not cut the animal bird
save the nature
love the soul respectably.
try to grove the nature for human.
veg is specially grow  from our ancient or god that they give us free gift to live  .
compassionate    ; like
we are  lion,    no
we are leopard,   no
we are human,   yes
so only we have proper brain for doing  right and wrong  ..
and that the third energy is always working quickly in human body .
there is enough
you need more knowledge you must read Bhagavatgita .
maria you have all this knowledge in side of you
you can access during the  meditation
you can churn your heart during meditation consciously.