Never! Like most of the world, I am lactose intolerant. Most people on the planet become lactose intolerant by the age of seven or so, as that is the outside age that most children breastfeed.
You only need lactase
(the enzyme that allows you to digest lactose, the sugar in all milk) when you are drinking your own mother's milk, so the body stops producing lactase in most humans in middle childhood.
No animal besides humans drink fluid milk after weaning, and most of the world believes (as does science) that the ONLY milk humans should consume should be human milk, and that is usually consumed while one is a baby and toddler.
Cow milk is the most common allergy in the world. I also have a Bovine IGA Protein allergy as well as a cow's whey (an other protien in milk) allergy.
Sorry, but I think milk consumption, other than human milk consumption by infants, toddlers and pre-schoolers is kind of gross. It isn't necessary for human nutrition (you are able to use NONE of the calcium from cow milk, as the phosphate levels in cow's milk are too high and leach more calcium from your bones than cow's milk can put there) In fact, nearly all women who have osteoporosis were big cow's milk drinkers for most of their post-weaned life.
I can't touch the stuff. It simply isn't food for human consumption as far as I know.
Also, humans often get "addicted" to foods they may have allergies to. When I stopped consuming cow's milk and cow's milk products in my early 20s, (because my babies couldn't tolerate the cow milk proteins that were coming through my
milk) I felt so much better. (But, I was addicted to it, and it was really difficult to stop! It took me a number of tries. But, aside from a small amount of butter (which has NO Bovine proteins in it) I haven't consumed any cow milk or products for many many years. I don't miss it a bit.
When I stopped drinking milk and eating milk products, my IBS got better, my allergies to other things got better, and I was able to get my nutritional status back on track (I was underweight and had a precarious nutritional status, despite eating well, except for the inclusion of cow milk and it's product in my diet.) IMO, it isn't a food for humans.
Do your own research. You'll find this isn't really a food for humans. Least of all something children should EVER drink. My kids NEVER drank cow's milk and have stronger bones than most of their peers, as well as better GI health etc. Really, look into the data, (avoiding propaganda from the Dairy Industry).
Sorry for the Text Wall. But, I feel really strongly about this, I have training and background in health and nutrition, as well as the specificity of milks ONLY from the species one belongs to, and only before weaning .
Actually, there IS Lactose in cheese
. It is often in a smaller amount than in fluid milk, but those with severe lactose intolerance (which is a normal state for people over seven) cannot even digest cheeses, yogurt, kefir, buttermilk etc. Although some can eat small amounts of butter. I need to say yogurt is NOT a magic food OR a health food. It's just predigested milk. It actually has more of some cow's milk proteins in it that fluid milk.
But, do your own research
. I'm willing to bet you that if you go off of ALL dairy products for at least 6 weeks your health will improve dramatically, even if you don't "notice" you are having health problems now. Not to mention that in addition to things like IgA Bovine Protein (which causes diabetes in humans) and lactose, most cow's milks also contain hormones, antibiotics, pesticide residue and other nasty things, that NO ONE needs in their diet. Even "Organic milk" contains some of these things, as controlling pesticides in the environment is impossible, and the way cows get rid of pesticides from their own bodies is to secrete them in their milk.
But, it is up to you. But, you also need to know exactly what is going into your body when you take in the milk that was meant for a bovine animal who has three stomachs, a large amount of muscle mass, (much larger than humans) that grows to adulthood in a year or so, and has a low intelligence etc. Cow's aren't human, and we shouldn't be consuming the milk meant for baby cows.
OK. Off soap box now.