That info may be fake regarding lactose byproducts"Side Effects Associated With Milk
Milk is considered to be healthier than many other types of dairy as it has more nutrients, fewer calories and less saturated fat. However, all milk products contain lactose. According to a 2014 study in the British Medical Journal, too much lactose can be bad for your health. Longitudinal studies like these have shown that drinking large amounts of milk each day (three or more glasses) may even increase the risk of mortality.
Lactose creates byproducts in your body during the digestion process that have been linked to aging, heart disease and cancers, such as prostate cancer. However, drinking milk in moderation (one or two glasses each day) doesn't seem to have the same negative effects on health. Consumption of fermented milk products or lower-lactose products (like goat's milk or plant-based milks) can also be healthier alternatives."
Are There Side Effects to Drinking a Gallon of Milk a Day? | Livestrong.com
A gallon of milk a day is an unhealthy dietary choice. In fact, drinking as little as three glasses of milk a day can be bad for your long-term health.www.livestrong.com