Not unless you consider it to be a sin at any other time of the year.
The first sin was commited by Lucifer when he aspired to be greater than God. The first human sin was commited by Eve in the Garden of Eden, when she ate of the fruit that God had forbidden Adam or Eve to eat from.
Adam and Eve disobeyed God by eating fruit from the tree of knowledge of good and evil, which He had forbidden them to eat. This act of disobedience is known as the original sin.
God told them that they were free to eat all the fruits and vegetables in the garden of Eden.
When the Devil tricked Eve to convince Adam to eat off the tree of knowledge.
It is true that Adam and Eve did eat the forbidden fruit, so sin and death came into the world.
All Fridays during Lent are meatless, and if you eat meat on Friday, deliberately and in spite of knowing it is against Church teachings, then it is a sin
To some it may be a sin to eat meat, to others it may not be. To some it's just a lifestyle choice not to eat meat, but they may not consider it to be a "sin". Unfortunately, meat (as far as I'm aware) is the only good natural source of vitamin B12, which is essential for good health. If meat contains essential vitamins that cannot be consumed for other non-meat sources, it is difficult to classify eating meat as a sin, as it is a "necessity". This seems the primary reason why it is difficult to classify meat-eating as a sin. However B12 is available in tablet form (and injection) so that no vegetarians have to compromise their health. Thus there is an argument that we should all go vegetarian to prevent global warming.
No God told Adam and Eve not to eat from the tree of good and evil.
Bhrahmins and those who consider it as sin according to religious customs.
The heart of Adam and Eve's first sin was disobedience to God. This is the root cause of every other sin.
According to the Bible, Adam and Eve, the first humans, were the cause of man's first sin in the story of the fall of man in the Garden of Eden. They disobeyed God's command not to eat from the tree of the knowledge of good and evil.
The snake that persuades them to eat the fruit represents Satan. The fruit that they eat represents a sin or something that they are tempted to do that God did not intend for them to.