How to Know If You Are Lactose Intolerant - Ask a Nutritionist
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In this episode of Dishing Up Nutrition, registered dietitian Amy Kumm addresses the common question of whether someone is truly lactose intolerant or experiencing another digestive issue. She explains that lactose intolerance stems from insufficient lactase enzyme production, leading to undigested lactose fermenting in the large intestine and causing symptoms like bloating, gas, diarrhea, and cramps—typically within 30 minutes to two hours after consuming dairy. Amy emphasizes that symptom patterns, such as improvement when avoiding dairy and recurrence upon reintroduction, are strong indicators. She distinguishes lactose intolerance from dairy allergies (which involve the immune system and can be life-threatening) and dairy sensitivity (which may cause fatigue, brain fog, skin issues, and joint pain, often delayed by hours or days). Practical strategies include trying low-lactose dairy options, using lactase supplements, choosing lactose-free or plant-based alternatives, and keeping a food and symptom journal. She also notes that dairy isn't essential for nutrition, as calcium and other nutrients can be obtained from non-dairy sources.
Symptoms of lactose intolerance typically appear 30 minutes to 2 hours after consuming dairy and include bloating, gas, diarrhea, and cramps.
Lactose intolerance is different from a dairy allergy (immune response) and dairy sensitivity (protein-related, with delayed symptoms like fatigue and skin issues).
A two-week elimination and reintroduction of dairy can help identify if lactose is the trigger.
Lactase enzyme supplements and low-lactose or lactose-free dairy products can help manage symptoms without full elimination.
You don’t need dairy to meet your nutritional needs—non-dairy calcium sources and supplements are effective alternatives.
Understanding Lactose Intolerance
Amy Kumm introduces the episode, explaining what lactose intolerance is and why it's common. She defines lactose as the natural sugar in milk and explains that lactase enzyme deficiency leads to undigested lactose in the gut.
Recognizing the Symptoms
The episode outlines key symptoms of lactose intolerance—bloating, gas, diarrhea, cramps, and nausea—and emphasizes that these occur within a predictable timeframe after dairy consumption.
Distinguishing Lactose Intolerance from Allergies and Sensitivities
“If symptoms go beyond digestion, think skin, breathing, or systemic reactions, that's not lactose intolerance.”
Diagnosis and Self-Testing Methods
The episode covers self-diagnosis tools like food and symptom logging, elimination diets, and the use of lactase supplements to test tolerance. Medical tests like hydrogen breath and lactose tolerance tests are mentioned but not required for most.
Practical Management and Nutritional Alternatives
“You don’t need dairy foods in your diet to get all of your nutrients.”
“You don’t need dairy foods in your diet to get all of your nutrients.”
“If symptoms go beyond digestion, think skin, breathing, or systemic reactions, that's not lactose intolerance.”
“The fermentation process of beverages like kombucha. It creates those fizzy bubbles. That's what's happening in your large intestine if lactose isn't broken down properly.”
Host
amy kumm
person
lactose
other
lactase
other
casein
other
whey
other
anaphylaxis
other
celiac disease
other
crohn's disease
other
nutritional weight and wellness
organization
hydrogen breath test
other
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