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Lactose
The sugar in milk. Without enough of the enzyme lactase, lactose reaches the colon and ferments.
Who reacts
Most adults in the world make less lactase after childhood. Hard aged cheese and butter contain very little lactose.
Typical onset
30 minutes to 6 hours after you eat it
Linked symptoms
BloatingStrong evidence
GasStrong evidence
DiarrheaStrong evidence
Stomach pain or crampsStrong evidence
NauseaModerate evidence
Where you find it
High:Milk · Ice cream
Medium:Yogurt · Soft cheese (ricotta, cottage)
Low:Heavy cream