The two-minute version

For one lunar month, Muslims who are able take no food or drink, not even water, from first light to sunset, and aim their evenings at prayer, Quran, and community. It's not suffering for its own sake: it's a yearly training in self-mastery, empathy with the hungry, and focus on God, and most Muslims genuinely love it and miss it when it ends. The fast breaks each sunset at a meal called iftar, and the month closes with the festival of Eid al-Fitr.

What's actually helpful

• Eat normally in front of them. Truly. They don't mind, they aren't tempted by your sandwich after day three, and tiptoeing is more awkward than lunch. Asking "is it okay if I eat?" once is kind; hiding is unnecessary.
• Flexibility beats sympathy. The genuinely useful accommodations: meetings not scheduled over sunset (their dinner has a fixed, astronomical deadline), a shifted lunch break they can use for prayer or a rest, and understanding if they're quieter at 4pm. Energy dips mid-afternoon and returns; competence doesn't change.
• Don't say "not even water?!" more than once. Every fasting Muslim hears it forty times a March. (Yes, not even water. They think it's kind of funny by now.)
• Skip "you've lost weight!" and "I could never do that." Better: "how's it going?" Fasting people mostly enjoy talking about it when asked with real curiosity.
• Accept the iftar invitation. If they invite you to break fast with them, at home or at the mosque's open iftar, go. Hospitality is the month's love language, and non-Muslim guests are genuinely welcomed, not recruited.

Useful to know

• Not everyone fasts: the ill, pregnant and nursing women, travellers, and menstruating women are exempted, and it's rude to audit ("you're eating? I thought...!"). If a Muslim is eating in Ramadan, there's a reason, and it's not your business or anyone else's.
• Dates move: Ramadan follows the lunar calendar, arriving ~11 days earlier each year, and the exact start can differ by a day between communities (moon sighting; long story, ask them, they enjoy it).
• The last ten days matter most: expect them extra devoted and possibly extra tired; the holiest night of the Islamic year hides in there.

When Eid arrives

Say "Eid Mubarak!" (eed moo-BAR-ak): blessed festival. It lands the way "Merry Christmas" does, and it will absolutely make their day coming from you. Eid is a day off if they can take it (worth remembering, managers), with a morning prayer, family, and a lot of food. Curious what their whole daily rhythm looks like the rest of the year? A day in the life · Wondering about the beliefs behind it? Start here.