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.