Question

why so we not eat meat on tuesday thursday and Saturdays

Answer 1

According to Hindu religion, Tuesday is dedicated to Lord Hanuman and therefore devotees who worship him should refrain from eating meat. But not eating non-vegetarian food is not restricted for only Tuesdays. Thursdays and Saturdays are also considered holy days when people should avoid eating meat.
So we can say it's due to Hindu methodology that meat is restricted on these days...



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Answer 2

it is not compulsory that we are not allowed to eat meat on the above days these are just the beliefs of the people not to eat meat on these holy days.