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Buddhists should eat healthy food like you and me. However, if you are a meditating Buddhist you should avoid (not forbidden; avoid) meat eating as the energy of meat-based food could cause disturbance during your meditation.
As the question speaks about the Main Diet (major, key, central, principal, chief, prime), it is rice and rice related foods like noodles etc, because all most all the Buddhist people are living in the Asian region.
One of the precepts of Buddhism is "to abstain from killing sentient beings" , therefore if devout Buddhist is to prepare food for himself, he will always prefer vegetables. However, Buddhist will eat any food given to them as offerings. According to tradition, Gautama Buddha himself died by eating spoiled (?) foods given to him as offering when he was 80 years old.
Buddhists main rule is 'Not To Harm Others'
All Buddhists do not eat lamb. All of any group do not act the same way. Some Buddhists are vegetarian, some have more omnivorous diets. The only restraint is that a Buddhist should not specifically require an animal be killed for him to eat.
Ther eis no main country of Buddhists. Buddhists can be found in almost every country in the world. There is a larger concentration of Buddhists in East Asia (Nepal, China, Sri Lanka, Japan, Korea, etc) which is near to where The Buddha historically lived.
A main place for a Buddhist to worship is in a temple called the Vihara. I hope this will help.
They may do. Buddhists vary widely in the diets they adopt. While monks and nuns are usually vegetarian, or even vegan, there is no reason why they can't have vegetarian pizza. Other followers of the faith have much wider diets, including meat, so I'm sure many of them enjoy pizza.
Roman Catholics is the wrong answer, it is Buddhists
Buddhists can eat cheese, but whether they do depends on individual beliefs and practices. Some Buddhists, particularly those following strict vegetarian or vegan diets, may avoid cheese due to its animal-derived ingredients, such as rennet. Others may consume certain types of cheese if they align with their dietary choices and ethical considerations. Ultimately, the decision varies among practitioners.
meat
Hindu has a caste system that is super strict with social class
Buddhists practice Buddhism, based on the teachings of the Buddha, 'the enlightened One'. Buddhists meditate and practice acts of compassion. There are no dogmas, and you don't have to believe in God. Also see, 'What do Buddhists believe?'
We Buddhists believe in no immortal, all-powerful deities, not even the Buddha, who was just a man.
Although Buddhists may examine and study the origins of life they are more concerned that it did come to be without examining the cause. Unlike the Abrahamic faiths who require a deity to be the main mover for the formation of life Buddhists would be as happy with life originating as a natural and chemical process.