Pattern explainer
Why do I feel bloated after eating dairy?
Dairy is a common bloating trigger because most adults make less lactase with age. Here is the mechanism, and how to spot the pattern at home.
Written by Alex Antoniou, MD, MBA — MD, MBA, Lifestyle Medicine certified.
What the research suggests
The mechanism, in plain language.
Most adults make less of the enzyme lactase as they age. Lactase is what splits lactose — the sugar in milk — into two simpler sugars the small intestine can absorb. When the enzyme runs short, lactose moves on to the colon, where bacteria ferment it. That fermentation produces hydrogen, methane, and short-chain fatty acids, which is what creates the gas, distention, and rumbling people describe as bloating. Dose matters. A splash of milk in coffee tends to be tolerated; a tall glass of milk or a bowl of ice cream is more likely to cross the threshold. Hard aged cheeses and fermented dairy like yogurt and kefir have less residual lactose and tend to be gentler.
What to log to see this in your own data
Your pattern is yours.
HealthBrew tracks what you ate alongside next-day digestion notes. Over a couple of weeks, Sophia notices which dairy foods seem to coincide with bloating for you, and which do not. Some people are fine with cheese and react to milk. Others react to both. The map is yours — Sophia just hands it back to you.
Related patterns
Other patterns Sophia notices.
See your own pattern in HealthBrew.
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Education, not medical advice. This page describes patterns commonly seen in lifestyle-medicine research. It is not a diagnosis and not a treatment plan. Talk to your clinician for diagnosis and care decisions specific to you.