Overview
About Lactose
Lactose sensitivity flags the milk sugar in dairy — like milk, ice cream, and soft cheese — that can ferment and cause symptoms when your lactase levels are low.
Lactose is the natural sugar in milk and dairy products. People with lactose intolerance lack sufficient lactase enzyme to digest it, leading to bloating, gas, and digestive discomfort after consuming dairy.
In the data
Where you will find lactose
- Graded high in lactose, the same as milk. Live cultures supply lactase that helps at the moment of digestion, but plain yogurt is not a low-lactose food and a large bowl still counts.
- Borderline for histamine and for tyramine, both a consequence of fermentation that fresh milk does not have. Flushing, headache or a blocked nose after yogurt points here rather than at the lactose.
- High in lactose (grade E), a common cause of bloating, cramping and loose stools if you lack lactase
- Very high in lactose in fresh cheeses like ricotta and cottage cheese, a leading cause of bloating and diarrhea if you are lactose intolerant
- High in dairy protein (casein and whey) in every type, so it still triggers a milk protein sensitivity even when the cheese is aged and low in lactose
- Graded high in lactose and high FODMAP, so a full glass is a far bigger challenge than the splash in a coffee. Lactose intolerance is dose dependent, and most people who have it still handle small amounts taken alongside food.
- Graded high in dairy protein. Casein and whey are the allergy half of the story, and they survive every process that targets the sugar, including lactase drops and lactose-free labelling.
Examples
A few ingredients either way
Rated high
Grading
How we grade lactose
Every ingredient in the database carries one grade for lactose, and this page, the checker and the app all read that same grade. It describes the ingredient as it is usually eaten. Portion size and preparation move it.
Practical
Working with lactose
- Try lactose-free milk or hard cheeses like parmesan.
- Eating dairy with other foods can help digestion.
- Try lactose-free dairy products - they're real dairy with lactase added
- Hard aged cheeses are naturally lower in lactose
- Lactase enzyme supplements can help when eating dairy
- Yogurt and kefir may be better tolerated due to probiotics
- Your tolerance level is personal - some can handle small amounts
Method
Test it with a diary
Most people find their own triggers by logging meals and symptoms for a few weeks and reading the result back. Three steps.
- 1Log every meal for a few weeks. Type it, say it out loud, or scan a barcode, and it lands as a list of ingredients.
- 2Rate how you feel through the day on whatever you are tracking, whether that is bloating, headaches, skin or sleep.
- 3Read the pattern back. Every ingredient you logged is scored against the days you felt worse, and the result ranks lactose against everything else you eat.
Questions
Questions people ask
Is half-and-half high in lactose?
Yes. It is roughly half milk and half cream, and both contain lactose. A splash in one coffee is a small dose, but several coffees a day can add up to enough lactose to cause bloating, gas or diarrhea if you are lactose intolerant. Lactose-free half-and-half fixes the lactose, but not the dairy protein.
More about half-and-halfIs cottage cheese lower in lactose than milk?
Not reliably. Some of the whey is drained off during production, but cottage cheese keeps enough lactose to be graded high, and many lactose-intolerant people report the same bloating they get from milk. If lactose is your issue, a lactose-free version or a plant-based high-protein food like tofu or edamame is a safer swap.
More about cottage cheeseCan I eat cheese if I am lactose intolerant?
Many people with lactose intolerance tolerate hard aged cheeses because ripening removes most of the lactose, but the casein and whey dairy proteins remain, so cheese is still a problem if your issue is a milk protein sensitivity rather than lactose.
More about cheeseHow much lactose can I have if I am lactose intolerant?
More than most people expect. Research on lactose malabsorption consistently finds that around 12 g in one sitting, roughly a cup of milk, is tolerated by most adults with few or no symptoms, especially when it comes with a meal rather than on an empty stomach. Spreading dairy across the day works better than one large serving. Intolerance is a threshold, not a switch, and finding your own threshold is the point of logging it.
More about milkIs condensed milk high in lactose?
Yes, very. Condensed milk is made by removing most of the water from cow milk, which concentrates the lactose. Gram for gram it carries more lactose than fresh milk, so even a small amount in desserts or coffee can trigger lactose intolerance symptoms.
More about condensed milk
Read next
Where to go next
References
Lactose sources
Where the lactose grades come from: food composition databases, clinical guidelines and patient organisations.
5 sources from peer-reviewed research, regulatory bodies, and clinical guidelines.
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Tracking lactose?
Log what you eat and how you feel, and the app finds the pattern for you. Or look an ingredient up here first.
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