Why the same drinks hit guests differently

By the end of this lesson you can explain why two guests with the same order end up in different states. That is the reason you watch people and not only tabs.

Two friends sit down and order the same thing: three pints over two hours, same beer, same size. One walks out steady. The other is slurring at the door. Your count was right. The drinks were identical, and the two bodies were not.

The nine factors

Health Canada names what changes alcohol's effect on a person:

• The amount you drink
• Your gender and age
• Your body size
• How quickly you drink
• The amount and type of food you have eaten
• Medications you are taking that may interact with alcohol
• Your past experiences with drinking
• Your overall health
• Your mood

Health Canada writes "factors such as" before that list, so treat it as the main ones and not the only ones. The same page says how long alcohol takes to affect a person varies greatly. Nine variables sit behind every glass you pour.

What the factors mean at your table

Your tab shows two of the nine: how much a guest drank and how fast. The other seven walk in the door with the guest, and you cannot see any of them.

Body size, gender, age, and overall health are fixed before the first order. You will not know them, and you will not ask. Medications are the same, with one difference that matters to you. Canada's guidance says no alcohol is safest when a person is taking medicine or other drugs that interact with alcohol. If a guest mentions a prescription, that is the guidance speaking, not a hunch.

Past experience with drinking sits on the factor list too. Health Canada does not say which way it cuts for any one guest. The AGCO makes the practical point instead: individual reactions vary, and the signs of intoxication can appear in any order or arrive in a cluster. A guest who drinks often may not match the picture in your head.

Two factors are yours to work on. Speed is one, and food is the other. Lesson 1-1 covers how food slows absorption and why an empty stomach speeds it up.

You can also turn unknowns into knowns by talking. The AGCO tells you to chat with customers before you take the order. Have they eaten? Does it look like they have been drinking somewhere else, or using cannabis? Two questions at the start of service tell you more than a full night of counting glasses.

When the safest amount is zero

Canada's guidance names people and situations where no alcohol is the safest amount. Know these so you can answer a guest honestly. None of them turns you into an inspector of your guests' lives.

• Pregnancy: when pregnant or trying to get pregnant, there is no known safe amount of alcohol use.
• Breastfeeding: not drinking alcohol is safest.
• Youth: the main message is to delay alcohol use for as long as possible. Ontario's floor is 19. Section 33 of the Liquor Licence and Control Act, 2019 bans selling or supplying liquor to anyone younger.
• Situations: driving a motor vehicle, using machinery and tools, taking medicine or other drugs that interact with alcohol, doing any kind of dangerous physical activity, and being responsible for the safety of others.

The guidance also separates risk by sex. Above the upper limit of the moderate risk zone, which runs from 3 to 6 standard drinks a week, health risks rise more steeply for females than for males. Far more injuries, violence, and deaths result from men's alcohol use, and that gap is widest for drinking on a single occasion.

Use this as service awareness. A guest who asks for something without alcohol gets a real option, not an apology for the wine list. The AGCO asks licensed places to stock low-alcohol and non-alcoholic drinks, put them on the menu, price them competitively, and make mocktails worth ordering. That is how you serve every person at the table well.

The first signs you will see

The factor list explains why you watch. Here are four signs from the AGCO information sheet, as a preview of what watching looks like:

• Speech volume that does not fit the room. The guest shouts when nothing calls for it, or whispers with no secret to keep.
• Fine motor control slipping. The guest fumbles a phone, struggles to pick up change, or misjudges distances.
• Alertness dropping. The guest is slow to respond, and you end up repeating a simple question before they answer.
• Red eyes. Take note if a guest's eyes are bloodshot to any degree.

The AGCO warns that a single sign may not be linked to intoxication. On a first sign you monitor the guest and make food, water, and low-alcohol and non-alcoholic drinks available. Module 4 teaches the full sign list, the graduated response, and how to cut off and refuse service.

The trap to expect on the test

A question may describe two guests with matching orders and ask why one is impaired and the other is fine. The answer is the factor list, not the drinks. A question may also lean on a guest who "handles it well" and suggest that guest is safe to keep serving. Health Canada lists past experience as a factor in how alcohol affects a person. Nothing in that list removes alcohol from the body, which keeps circulating until the liver eliminates it, and lesson 1-2 covers that clearance.

Recap

• Health Canada lists nine factors that change alcohol's effect: amount, gender and age, body size, speed of drinking, food, interacting medications, past drinking experience, overall health, and mood.
• Two guests with the same order can end up in different states, because seven of the nine factors belong to the guest and not to your pour.
• Ask about food and about drinking elsewhere before you take the order. Those two questions convert guesswork into information.
• Canada's guidance says the safest amount is zero during pregnancy and breastfeeding, and the message for youth is to delay drinking as long as possible. Above 6 standard drinks a week, health risks rise more steeply for females than for males.
• Watch for speech volume, fine motor trouble, slower alertness, and red eyes. A single sign means monitor and offer food and alternatives. Module 4 covers refusal.