Myth: Milk Is Bad for Adults — Lactose Intolerance vs A1/A2 Protein Truth

The Claim

‘Milk is unnatural for adults.’ We are the only species that drinks another animal’s milk. Adults should not drink milk. Dairy causes inflammation, mucus, and stomach problems. Everyone should stop eating dairy.

What Is Actually True and What Is Not

True: Your body makes less lactase as you grow up

Lactase is the enzyme your body uses to break down lactose — the sugar in milk. Most mammals stop making it after childhood. In humans, it depends on your genes and your ancestry:

• People with Northern European roots: 80–95% still produce enough lactase as adults
• South and East Asian populations, including Indians: 60–70% produce less lactase by adulthood

So yes — many of us produce less lactase. But here is the thing nobody tells you: most of these people can still drink one cup of milk a day without any symptoms. True clinical lactose intolerance, where even a sip of milk causes serious trouble, is much rarer than the 60–70% figure makes it sound.

True: Fermented dairy is almost always fine — even if you are lactose intolerant

Think about what your nani had every single day — curd, chaas, a little paneer. She was probably ‘lactose intolerant’ by the textbook definition, but it never bothered her. Here is why:

• A2 curd: When milk ferments, bacteria eat up most of the lactose. By the time it becomes curd, very little lactose is left. Almost everyone tolerates it well
• Paneer: When paneer is made, the whey is drained out — and the lactose goes with it. Paneer is basically lactose-free
• Buttermilk (chaas): Fermented, diluted, easy on the stomach. Even people with quite low lactase handle this without trouble

Your traditional diet already had the solution built in.

The A1 vs A2 question — this matters more than lactose

Here is something most people do not know. A big reason many Indians feel uncomfortable after milk is not lactose at all. It is the type of protein in the milk.

• A1 beta-casein is found in most commercial milk in India — from Holstein and crossbred cows. When you digest A1 milk, it releases a compound called BCM-7 in your gut. This can cause bloating, discomfort, and inflammation in some people. Some research also links it to other health issues
• A2 beta-casein is what desi Indian cow breeds produce — Gir, Sahiwal, Ongole. These cows have been part of Indian villages for centuries. A2 milk does not produce BCM-7. Human breast milk is also A2. So is goat milk and sheep milk

Many people who have stomach trouble with commercial milk feel completely fine after switching to A2 milk. They were never lactose intolerant — they were A1 protein intolerant. Totally different problem, totally different fix.

False: Dairy causes inflammation for healthy adults

This one keeps going around on health forums and Instagram pages. The science does not support it. Multiple large reviews of research have found that dairy does not increase inflammation in people who do not have a milk allergy. In fact, curd — with its live probiotic bacteria — actually helps bring inflammation down.

The dairy-inflammation story mostly comes from people with a true milk allergy (which is an immune system reaction, quite different from lactose intolerance) and from influencers promoting elimination diets. These are not the same as solid science.

False: Adults simply do not need dairy

This is technically true but misleading. Your body does not absolutely require dairy to survive. But dairy is one of the easiest ways for a vegetarian Indian to get calcium, protein, B12, and vitamin K2 all in one place — and in a form your body absorbs efficiently.

If you stop dairy entirely, you have to be deliberate: ragi and sesame for calcium, B12 supplements (critical for vegetarians), and good protein from dal and seeds. Totally doable — but it takes planning. Dairy makes it much simpler.

The Bottom Line

Most Indians who feel uncomfortable with dairy are reacting to A1 protein or mild lactose reduction — not dairy itself. The answer is not to throw out the curd, the paneer, and the chaas that your family has eaten for generations. The answer is to switch to A2 milk from desi cow breeds and keep leaning on fermented dairy.

If you genuinely cannot tolerate even A2 curd or paneer — which is rare — then ragi, sesame, moringa, and a B12 supplement can give you what you need. But try the A2 switch first. For most people, that solves everything.

Q

Is milk the best source of calcium, or can I get enough without it?

A

Dairy calcium gets absorbed by your body the most efficiently — about 30–35% of what you eat actually makes it in. But you can absolutely get enough calcium without dairy. Ragi has 344mg of calcium per 100g. Til (sesame seeds) has a whopping 975mg per 100g. Moringa has 440mg per 100g. The catch is that calcium from plant sources gets absorbed a little less efficiently — roughly 15–25%. So you need to eat more of them and prepare them well — soak, cook, and eat with some vitamin C to help absorption. In practice, a cup of A2 curd with two ragi rotis a day and a spoonful of til in your food will cover your calcium needs well. Dairy-free is absolutely possible — it just needs a bit more thought.

Q

Does drinking milk cause acne?

A

There is some real evidence here — several studies have found a link between high milk consumption and acne, especially in teenagers and young adults. The suspected reason: milk contains IGF-1, a growth factor that can stimulate oil glands and androgen production, which contributes to acne. Interestingly, the link is strongest with skimmed milk, not whole milk. Curd and paneer have not shown the same association. If you notice your skin breaking out more when you drink a lot of milk, it is worth trying A2 curd and paneer instead of milk and seeing if that helps. That is a simple, practical experiment you can run yourself.