Lent is the English term for the 40-day period before Easter in which Christians fast, abstain, and otherwise practice self-control. (Assuming we practice such things at all.) In Latin it’s called quadragesima and in Greek it’s σαρακοστή/sarakostí, short for τεσσαρκοστή/tessarkostí—both of which mean “fortieth,” ’cause 40 days.
It starts Ash Wednesday, which isn’t 40 precise days before Easter; it’s 46. That’s because the six Sundays before Easter aren’t included. You don’t fast on feast days, and the sabbath day, on whatever day you observe it (and Christians usually do Sundays), is a feast day; it’s when we take a weekly break from our Lenten fasts. Many Christians don’t realize this, and wind up fasting Sundays too—since they’ve got that abstention momentum going anyway.
As for eastern Christians, Lent begins the week before Ash Wednesday, on Clean Monday. Partly because they don’t skip Sundays, and fast that day too; and partly ’cause their Lenten fast consists of the 40 days before Holy Week. Then they have a whole seperate fast for that week.
But no matter how you arrange it, all the fasting is finished by Easter.
Just as Jesus went without food 40 days in the wilderness, we go without… well, something. The first Christians who practiced Lent likely went all hardcore, and went without food and water. And after this practice gravely injured or killed enough of ’em, the early Christians decided maybe it’s wiser to stick to bread and water, or a vegan diet. Or, as American Catholics practice it nowadays, go without meat on Friday and Saturday. (Though for various iffy reasons, fish is considered an exception.)
Protestant custom is usually to cut back to two meals a day, then give up one extra something. Abstaining from the one thing has leaked back into popular culture and Catholicism, so now most pagans and many Christians think Lent only consists of giving up the one thing. Preferably something difficult: Giving up coffee or alcohol, chocolate or carbs, watching sports or playing video games, or anything we originally tried to give up for the New Year and failed at.
Whenever I’m asked what I’m doing without for Lent, I tend to joke, “I’m giving up fruits and vegetables. Nothing but cheeseburgers, coffee, and Cheez-Its till Easter.” The kids like to joke, “I’ll give up smoking,” since they already don’t smoke. (They might vape though.)
But all joking aside, abstaining from one thing isn’t a bad custom. And we’re not giving it up for Lent; properly we’re giving it up for Jesus.
So once we recognize this, we need to ask ourselves: Exactly how does this benefit Jesus? How will it grow our relationship with him? Does it grow our relationship with him?—are we abstaining because this is something we want, or he wants? Didja bother to ask him what he actually wants us to do without?
That’s most of the reason Christians pick something difficult to abstain from. It’s a reminder Jesus is infinitely more important than our favorite things. Really he should be our favorite thing, and during Lent that’s what he oughta become, in a far more obvious way than usual. And after Lent, oughta remain.
For this reason we shouldn’t just pick something we oughta give up anyway. If you figure, “I really oughta give up adultery for Lent”: Well duh. And you oughta give up adultery period. Don’t figure you’ll quit shoplifting, or verbally abusing people, or smacking your kids around… but only till Easter. Don’t save obeying God till Lent. Nor start sinning again once it’s Easter! Just stop.
Put some wisdom into your choice. The first time I abstained for Lent, I picked coffee. I love coffee. Makes sense to pick something which might have enough of a hold on me to tempt me. Problem is, when I have my coffee right after I wake up, the first words out of my mouth are, “Thank you Jesus for coffee”—I’m in a thanksgiving mood. From there, I can go on to prayer, devotions, and other ways of honoring him. But when I don’t have that coffee, it takes longer to get into that mood. No, I’m not saying I need coffee to worship Jesus; that’s stupid. But dropping coffee doesn’t help me any. (And lest you’re worried about my caffeine addiction, I usually drink decaf. Not just for Lent.)
Don’t pick a Lenten fast which’ll irritate others, or cause them hardship. I unthinkingly did this myself one year: I went without meat. In itself it’s not a bad thing… but I attended a party, was given the duty of ordering pizza, and selfishly only thought of my fast: I ordered nothing but vegetable and cheese pizzas. The other folks in the party of course wanted meat. They didn’t appreciate how I’d convenienced myself but inconvenienced them: I was behaving exactly like one of those self-righteous vegans who inflict their consciences upon everyone else. Lots of fasting Christians do likewise: If the friends wanna go out to eat, they respond, “Not that restaurant; I’m fasting,” and demand all their friends accommodate their devotion. That’s actually selfishness disguised as devotion. Don’t do that.
My students used to joke, “I’ll give up bathing.” (Of course. They’re kids.) But they smelled enough like foot cheese as it was; they really, really needed to bathe. And lest you get any ideas, don’t you give up bathing. Fasting is supposed to be invisible. Mt 6.16-18 Plus it’s common courtesy to not outrage our neighbors’ noses for no good reason.