The late Chief Rabbi, Jonathan Sacks, used to point out that religions should be wary of discarding their traditions, because they have a habit of coming back into fashion. There can be no better example than the tradition of giving up meat on Fridays. This was formerly the rule for Catholics, an easily understood and simple prohibition which reminded people of Christ’s suffering on Good Friday. During Lent, the abstinence was extended over 40 days, along with the avoidance of eggs and dairy products.