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Does Lactose Intolerance Get Worse With Age?

Lactase over a lifetime

Does Lactose Intolerance Get Worse With Age?

If dairy treated you better at 15 than at 45, you're not imagining it. Here's what NIH sources say about lactase and age.

The short answer: for most people, lactase activity gradually declines after infancy. [1][2] But having less lactase doesn't always mean having symptoms, and how much you eat matters. [3][4]

Lactase over a lifetime

More lactase = easier to digest dairy. As lactase drops, dairy can start to bother you.

Illustrative, not to scale
LactaseChance of dairy discomfort
Illustrative lactase activity and dairy discomfort curves A curve that starts high in infancy and gradually declines through childhood, the teen years and adulthood. A second curve, chance of dairy discomfort, rises as lactase falls. Shape only; no values. Lactase activity InfancyChildhoodTeensAdulthood High after birth Lower for most people

Shape is illustrative only; no values are implied. For most people, LCT gene activity gradually decreases after infancy, and NIDDK says lactase levels get lower with age. [1][2] Some people keep lactase into adulthood (lactase persistence). [1]

When symptoms commonly show up

  1. 👶InfancyLactase activity is high in most babies. [1]
  2. 🧒Later childhoodSymptoms may begin here. [2]
  3. 🧑Teen yearsOr not until the teens. [2]
  4. 🧑‍💼Early adulthoodOr not until early adulthood. [2]

Dark-topped stages are the ones NIDDK names for when symptoms may begin. [2] New symptoms at any age can also come from an injury to the small intestine (secondary lactose intolerance); ask a doctor. [2]

Low lactase ≠ automatic symptoms

Less lactaseNot everyone notices.Most people with lactose malabsorption don't have clinical lactose intolerance, per the NIH consensus panel. [3]
Dose mattersSmaller servings, with food. Many people can handle up to about 5 g of lactose at one time, especially with food. [4] Most keep some lactase and can include varying amounts of lactose. [1]

The meter is illustrative. See How Much Lactose Is In That? for food-by-food amounts.

Your questions, answered

Does lactose intolerance get worse with age?

For many people, lactase activity declines gradually after infancy. MedlinePlus describes the gradual decrease in LCT gene activity after infancy that happens in most people. [1] NIDDK says lactase levels get lower with age. [2]

When do symptoms usually start?

NIDDK says symptoms may not begin until later childhood, the teen years or early adulthood. [2]

Why did dairy suddenly start bothering me?

Gradual lactase decline is the most common cause. [2] Lactose intolerance can also follow an injury to the small intestine (secondary lactose intolerance), and if the cause is treated, lactose may be tolerated again. [2] A doctor can help figure out which applies to you.

Do I have to give up dairy?

Usually not. Most people with lactase non-persistence keep some lactase activity and can include varying amounts of lactose in their diet. [1] Many can handle up to about 5 g of lactose at one time, especially with food. [4]

Does everyone with low lactase get symptoms?

No. The NIH consensus panel noted that most people with lactose malabsorption don't have clinical lactose intolerance. [3]

What can help as I get older?

NIDDK suggests having small amounts of milk at a time with meals, trying yogurt and hard cheeses, and using lactase products or lactose-free products. [5] A once-daily probiotic + prebiotic is another way to support lactose digestion.*

How common is it?

About 65% of people have a reduced ability to digest lactose after infancy. [1]

Practical tips from NIDDK

Small amounts, with mealsHave milk in small amounts at a time, with food. [5]
Yogurt & hard cheesesTry them as part of your routine. [5]
Lactase or lactose-freeLactase products and lactose-free products are options. [5]
New symptoms? Check inA doctor can help rule out secondary causes. [2]
65%

What the research found

lower combined daily symptom scores with the studied strain versus placebo over two weeks.*

Randomized, double-blind, placebo-controlled pilot study of 21 lactose maldigesters (Ramakrishnan et al., 2025). [6] The study tested the strain, not the finished Holy Cow! product.

How Holy Cow! fits in

1Every morning

Take once daily in the morning, ideally on an empty stomach, with water.

2First 21 days

Keep your regular lactase routine for the first 21 days.

3Keep going

We recommend continued daily use for best results.*

One capsule a day to support lactose digestion*

Holy Cow! is a once-daily probiotic + prebiotic.

$39.99 one-time, or $35.99/mo with Subscribe & Save. New here? Use code WELCOME20 for 20% off your first one-time order.

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Go deeper

Lactose Intolerance by AncestryThe History of Lactose IntoleranceHow Much Lactose Is In That?

Compare

Holy Cow! vs Lactaid Holy Cow! vs DairyPill Holy Cow! vs LactoJoy Holy Cow! vs Jollimoo Holy Cow! vs Bactose

Sources

  1. MedlinePlus Genetics. Lactose intolerance. U.S. National Library of Medicine. medlineplus.gov
  2. NIDDK. Symptoms & causes of lactose intolerance. niddk.nih.gov
  3. Suchy FJ, et al. NIH Consensus Development Conference Statement: Lactose intolerance and health. NIH Consens State Sci Statements. 2010;27(2):1–27. PMID 20186234
  4. Facioni MS, Raspini B, Pivari F, Dogliotti E, Cena H. Nutritional management of lactose intolerance: the importance of diet and food labelling. J Transl Med. 2020;18:260. PMC7318541
  5. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Eating, diet, & nutrition for lactose intolerance. niddk.nih.gov
  6. Ramakrishnan M, et al. Gut Microbes Reports. 2025. doi:10.1080/29933935.2025.2508199. PMC12940102

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

This page is general information, not medical advice. Lactose intolerance is not the same as a milk allergy; if you have a milk allergy, talk to your doctor. Lactaid® is a registered trademark of its owner. Holy Cow! is not affiliated with, endorsed by, or sponsored by Lactaid or its owner.