Glossary
Lactose Intolerance
Updated February 28, 2026
Lactose Intolerance is a digestion limit, and tolerance is often tied to total dose and timing.
Mechanism and symptom timing
| Mechanism | Typical response timing | What it tends to explain |
|---|---|---|
| Low lactase activity | 30 min to 2 hours post intake | bloating, cramping, loose stool, gas |
| Full-dose dairy challenge | Early and strong response in sensitive users | dose-threshold behavior |
| Combined high-fat load | Delayed onset and longer discomfort | delayed gastric emptying overlap |
Staged tolerance protocol
| Dose step | Daily challenge | Target observation window | Escalation rule |
|---|---|---|---|
| Step 1 | 1 to 2 g lactose equivalents | 24 hours | no meaningful rise in symptom score |
| Step 2 | 5 g lactose equivalent | 24 hours | symptoms must be low and recovery fast |
| Step 3 | 10 g lactose equivalent | 24 hours | repeatability before adding more |
| Step 4 | 20 g lactose equivalent | 24 to 48 hours | cap for now if any major discomfort recurs |
Separate intolerance from broader GI pattern
| Clue | Likely path | Next test |
|---|---|---|
| Flat symptom response to graded lactose | Lactose not primary driver | test fat and fermentable carbohydrate pattern |
| Symptoms only with milk but not cheese or yogurt | matrix-specific tolerance | test one matrix source in a fixed format |
| Bloating plus reflux and headaches | wider sensitivity set | combine with food intolerance workflow |
Keep calcium intake, protein timing, and food diary logic steady so nutrition quality stays stable during testing. If fermented dairy foods are part of the trial, use fermented foods and probiotics to separate live-culture questions from lactose dose questions.