Two completely different things that are often mixed up
If you have tummy trouble, bloating or run to the toilet just a little too often after milk or cheese, you will soon hear the word lactose intolerance. But maybe something else is at play: cow's milk intolerance. The names are similar, the complaints sometimes too, but the cause and approach differ considerably. In this blog, we explain it razor-sharp, with practical examples and clear signposts.
The difference with lactose intolerance
If you have tummy trouble, bloating or run to the toilet just a little too often after milk or cheese, you soon hear "lactose intolerance." Sometimes something else comes into play: cow's milk intolerance. The names are similar, the symptoms may overlap, but the cause and approach really differ.
| Section | Lactose intolerance | Cow's milk intolerance |
|---|---|---|
| What triggers | Milk sugar (lactose) | Milk proteins (casein, whey) |
| Mechanism | Shortage of lactase as a result of which lactose is not properly broken down | Sensitivity response On protein, no classical allergy |
| Typical timing | Quick: often inside 30-120 min upon ingestion | Delayed: sometimes pass hours or the next day |
| Most common complaints | Bloated abdomen, gas, cramps, sometimes diarrhea | Abdominal pain plus fatigue, headache, skin complaints, dip in concentration |
| Examples that often trigger | Milk, custard, cream, fresh and young cheeses, ice cream | All products with cow's milk protein: milk, yogurt, cheese, cream and processed foods containing milk components |
| What helps | Lactose-free choose whether lactase use | Avoiding cow's milk protein, vegetable alternatives |
Lactose intolerance: reaction to milk sugar
Lactose intolerance is all about lactose, the milk sugar in dairy products. You are partly missing the enzyme lactase to break down that sugar into glucose and galactose. As a result, lactose enters the colon undigested, where bacteria ferment. That gives especially flatulence, cramps, abdominal bloating and sometimes diarrhea, often within 30 to 120 minutes after eating or drinking. What usually helps: lactose-free dairy or lactase around meals because then you avoid or still break down the sugar. Read more: What is lactose intolerance, What does lactase do, and practical use in What are lactose intolerance pills.
Cow's milk intolerance: reaction to milk proteins
In cow's milk intolerance, the problem lies with the milk proteins (such as casein and whey). It is not a classic allergy with antibodies, but rather a sensitivity reaction in digestion and metabolism. The symptom picture is often wider: in addition to abdominal complaints fatigue, headache, skin complaints or dip in concentration. The timing is regularly delayed and can only hours or the next day play up. What helps is avoid cow's milk proteins and opt for plant-based alternatives. Lactose-free is usually not a solution here, as the proteins remain. Read more: What is cow's milk intolerance.
Summary and next step
Suiker vs. eiwit is de kern: lactose-intolerantie reageert op lactose, koemelkintolerantie op milk proteins. Twijfel je wat bij jou speelt? Test het gestructureerd en stap voor stap met een rustperiode en twee gerichte proeven, zodat je één variabele per keer checkt. Handig stappenplan: How to test whether or not you can tolerate cow's milk well.

What is lactose intolerance
Lactose is the natural sugar in milk. In order to absorb it, the enzyme lactase lactose into two smaller pieces. Make your insufficient lactase, then lactose remains undigested. Intestinal bacteria enter the ferment and produce gas and acids. You can feel that as flatulence, bloated belly, abdominal cramps and sometimes diarrhea. Often within 30 to 120 minutes After eating or drinking.
Good to know: you can often still do a lot with lactose-free dairy or with lactase supplements for occasionally. Read the background here: What does lactase do and the practical guide: What are lactose intolerance pills.
What is cow's milk intolerance
At cow's milk intolerance the problem is not in the sugar, but in the proteins from cow's milk. Your immune system doesn't have to immediately sound the alarm as it does with a allergy, but your body reacts hypersensitive. Complaints are often wider and delayed: in addition to abdominal complaints fatigue, headache, skin complaints and concentration dip. Sometimes you don't notice it until hours or one day later.
Cow's milk intolerance is usually solved by avoid cow's milk proteins. Also lactose-free dairy doesn't help then, because that's where the proteins still in. Read more: What is cow's milk intolerance.
Do you hesitate between intolerance and allergy. Then read: What is the difference between cow's milk allergy and cow's milk intolerance.

The main differences at a glance
Cause
Bij lactose-intolerantie ligt het probleem bij de suiker in melk: er is een tekort aan het enzym lactase dat lactose moet afbreken. Bij koemelkintolerantie draait het juist om de eiwitten in melk, zoals caseïne en wei, waar je spijsvertering gevoelig op kan reageren.
Complaints
Lactose-intolerantie geeft vooral darmklachten: gasvorming, krampen, een opgeblazen buik en soms diarree. Koemelkintolerantie laat vaak een breder beeld zien, met naast buikklachten ook vermoeidheid, hoofdpijn of huidproblemen.
Timing
Klachten door lactose-intolerantie ontstaan meestal snel, vaak binnen 30 tot 120 minuten na inname. Bij koemelkintolerantie komen klachten regelmatig vertraagd op, soms pas na enkele uren of zelfs een dag later.
What can you still
Met lactose-intolerantie kun je vaak prima uit de voeten met lactosevrije zuivel, harde gerijpte kazen en waar nodig lactasepillen. Bij koemelkintolerantie is het verstandiger koemelkeiwitten te vermijden en te kiezen voor plantaardige alternatieven.
How to discover what suits you
Begin met een rest period zonder koemelk en lactose tot je buik kalm is, en houd een food diary bij. Test daarna one variable at a time: eerst een lactose-test met een kleine portie lactose zonder koemelkeiwit (bijv. geiten- of schapenmelk/yoghurt). Neem weer rest, en doe vervolgens een melkeiwit-test with lactose-free cow's milk of lactosevrije yoghurt. Houd de test pure: niet beide testen op één dag, gebruik vergelijkbare porties en tijdstippen, verander verder niets in je menu, en noteer alles consequent. Schakel je huisarts of diëtist in bij twijfel of heftige klachten.
Het volledige stappenplan staat hier: How to test whether or not you can tolerate cow's milk well.
Please note: I am not a doctor and do not give medical advice. Everything you read is based on my own experience and collected research. In doubt? If so, always contact a doctor or specialist.

What can you eat for lactose intolerance
Met lactose-intolerantie kun je vaak prima uit de voeten met lactose-free dairy, zoals melk, yoghurt, vla en (kook)room. In deze producten is de lactose vooraf afgebroken, waardoor ze voor veel mensen goed te verdragen zijn. Daarnaast worden harde, gerijpte kazen regelmatig beter verdragen omdat ze door het rijpingsproces weinig lactose bevatten. Een handig overzicht vind je in: Which cheeses contain high or low levels of lactose.
Voor situaties waarin je niet zeker weet of er lactose in een gerecht zit, kunnen lactase-supplementen helpen; die gebruik je vlak voor of bij de eerste hap. Lees meer in: What are lactose intolerance pills. Wil je zuivel vermijden, kies dan voor plant-based alternatives zoals haver, soja, amandel of kokos. Proef wat bij jou past en bouw rustig op. Dus opgesomd:
- Lactose-free dairy such as milk, yogurt, custard, cream.
- Hard cheeses with little lactose. See: Which cheeses contain high or low levels of lactose.
- Lactase supplements For times when you're not sure what's in the food. Read: What are lactose intolerance pills.
- Plant-based alternatives such as oats, soy, almond or coconut.
What can you eat for cow's milk intolerance
Bij koemelkintolerantie draait het om de milk proteins. Kies daarom in de basis voor plant-based alternatives zoals haver, soja, amandel of rijst. Ga bij voorkeur voor varianten met added calcium and vitamin D, zodat je voedingsmatig goed uitkomt. Lactose-free dairy is hier meestal geen oplossing, omdat de melkeiwitten blijven bestaan.
Let tot slot op hidden dairy in bijvoorbeeld sauzen, snacks en vleeswaren. Etiketten lezen helpt om melkbestanddelen te herkennen (zoals melkpoeder, wei of caseïne). Praktische tips vind je in: Check the ingredient list. Dus opgesomd:
- Plant-based alternatives: oats, soy, almond, rice. Choose variants with added calcium and vitamin D.
- Lactose-free dairy is usually no solution, the proteins remain present.
- Note hidden dairy in sauces, snacks and meats. Assistance needed. See: Check the ingredient list.
Frequently Asked Questions
What is the difference between lactose intolerance and cow's milk intolerance
Lactose intolerance is about lactose. Your body does not make enough lactase To digest lactose. Cow's milk intolerance is about milk proteins such as casein and whey. With lactose, avoiding or breaking down lactose helps; with cow's milk intolerance, avoiding milk proteins helps.
How to recognize lactose intolerance versus cow's milk intolerance
At lactose intolerance you often see intestinal complaints such as gas, cramps, bloating and sometimes diarrhea. At cow's milk intolerance other signs may appear in addition to abdominal symptoms, such as fatigue, headaches, skin complaints or difficulty concentrating.
How soon do you get symptoms with lactose intolerance and with cow's milk intolerance
At lactose complaints usually arise within 30 to 120 minutes. At cow's milk intolerance complaints may occur later, sometimes not until hours or a day after consumption.
How do I test the difference between lactose and milk protein sensitivity
First, take a rest period and hold a food diary at. Then test separately: 1. one serving with lactose but without cow's milk protein. 2. After halftime a serving with milk protein but lactose-free. Compare your responses. Do not do this on the same day and use similar portions.
Is lactose-free milk suitable for cow's milk intolerance
No. Lactose-free milk still contains milk proteins. With cow's milk intolerance, the sensitivity is precisely about those proteins. In that case, prefer to choose plant-based alternatives.
Do lactase supplements help with cow's milk intolerance
Lactase only breaks lactose af. With cow's milk intolerance, the following play a role milk proteins a role. Thus, lactase supplements do not help with this.
Can you have lactose intolerance and cow's milk intolerance at the same time
Yes, you can. Some people respond both to lactose as on milk proteins. In that case, it is necessary to avoid or limit both.
Continue reading at NooMooo
- Basic explanation: What is lactose intolerance
- Deepening on milk proteins: What is cow's milk intolerance
- Mechanism in your gut: What does lactase do
- Deciphering labels: Check the ingredient list
- Choosing cheese without the tummy hassle: Which cheeses contain high or low levels of lactose
- Smart takeaway: What are lactose intolerance pills

Together the peace back in your belly
Whether it is lactose goes or to milk proteins, with some knowledge and structure you will come a long way. Test calmly, listen to your body and choose the route that suits you. On NooMooo you will find honest explanation, familiar stories and practical tips in one place.
Note. This blog is informational. I am not a doctor and do not give medical advice. If in doubt, contact your doctor or dietitian.

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