But when it comes to kids, cow's milk is a must-have -- and always in its fattiest form, experts say.
Milk is a good source of calcium, iodine, vitamins A and B12, and fat -- and it's the fat that helps children meet their energy requirements, says Lucy Upton, a specialist pediatric dietician and spokesperson for the Association of UK Dieticians.
"Fat is very important in children," says Upton. "They have very high energy requirements."
The three key energy sources for kids are dairy, protein and carbohydrates, and kids need significantly more energy per pound (or kilo) than adults. "The average two-year-old needs 80 calories per kilogram of weight," she says, highlighting that adults need less than half that amount.
So why deprive them of the good stuff when they've got so much energy to consume?
Don't, experts advise, unless intolerance or allergy is a genuine issue -- something that occurs in 2% to 7% of children, Upton says.
Avoid toddler milks, despite what the ads say
You may not have heard of toddler milk, but today it's a widely available product targeting children aged 12 months to three years, marketed as a follow-up drink to baby formula.
But a study published Tuesday found that between 2006 and 2015, toddler milk sales increased by 2.6 times, from 47 to 121 million ounces, aided in large part by increased advertising.
"We found that sales and adverts for toddler milk increased and decreased for formula," said Yoon-Young Choi, a statistician at the University of Connecticut's Rudd Center for Food Policy & Obesity.
The team believe this may be because of an increase in breastfeeding rates in recent years, reducing sales of formula and pushing interest toward toddler milk.
But the advice is clear: The next stop after 12 months is natural, whole milk for children, and those ages 12 to 24 months should have two to three cups of whole milk daily.
Keep it full-fat
"We don't recommend skimmed milk [for] children," says Upton, particularly in children under the age of five. Even in older kids, it would very much be on an individual basis, she adds. (Skimmed milk in the UK is the same as skim milk in the US.)
Simon Steenson, a nutrition scientist at the British Nutrition Foundation, agrees, noting that "children who are eating well can be given semi-skimmed milk after 2 years, but skimmed or 1% milk is not suitable as a drink for children under 5 years," he says.
In fact, the odds of them being obese were 39% lower than kids who drank reduced-fat milk.
The team analyzed 14 studies that included 20,897 children, comparing children who drank whole milk (3.25% fat) with ones who drank reduced-fat (1.5 to 2% fat) milk.
The kids drinking the full-fat milk were not heavier, explains Jonathon Maguire, an associate professor of pediatrics at the University of Toronto, who led the study.
But Maguire stresses that the findings were purely observational and that there could be many reasons why this could be true.
Kids who drink full-fat milk could feel more full, he suggests, or else there could be the chance that parents who drink lower-fat milk have kids who are bigger, he says -- a rationale known as "reverse causality."
Maguire and his team will now conduct a randomized, controlled trial with 500 children under the age of five over a two-year period to see more directly whether the fat content of the milk they drink is a key factor in determining their weight. They will account for the kids' snacking habits, their starting weights and other factors that could affect weight.
It's important we "understand the health effects of what we do with our children," Maguire told CNN. "Parents are making these decisions on a day-to-day basis" and they need evidence, he says.
Upton is glad to hear a trial will soon be underway to determine the true cause for this link between full-fat milk and obesity risk. "Multiple factors affect BMI (Body Mass Index) in children," she says, giving the examples of portion sizes, meal frequency, snacking and activity levels. '"It's a very complex issue."
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