Originally Published: 03 FEB 23 12:00 ET

By Jen Christensen, CNN

(CNN) -- If new US Department of Agriculture school food guidelines stand as proposed, chocolate milk is in, but for the first time ever, at least some added sugars will be out -- and sodium levels will be reduced gradually.

Agriculture Secretary Tom Vilsack publicly announced the changes on Friday.

"The purpose of this is to improve the health and welfare of our children. And I think everybody who comes to this issue shares that goal and hopefully, collectively, we can make sure it happens," Vilsack told CNN in an interview Thursday ahead of the announcement.

How school meals could change

The federally assisted school meal program provides nutritionally balanced meals at school at low or no-cost.

More than 15.3 million kids every day get breakfast at school in the US and 29.6 million get a school lunch, Vilsack said. The numbers were higher earlier in the pandemic, when meals were offered free to all children regardless of their family's income, but in June, Congress did not extend the Covid-19 pandemic waivers that had expanded the program.

While school meals are paid for by local and federal funding, the standards for what goes on a kids' cafeteria tray are set by the USDA. The agency's job is to make sure any meal served at school is nutritious and falls in line with the US Dietary Guidelines.

Flavored milk with "reasonable limits on added sugars" would be allowed under the proposal. Vilsack said school meal administrators tell the USDA that kids just won't drink much no-fat skim milk or unflavored milk. "That's not what they get at home," Vilsack said. "We want to encourage kids to drink milk because there are there's tremendous nutritional value in milk."

However, the proposed standards would limit added sugar in certain high-sugar products like prepackaged muffins, yogurt, and cereal. Eventually, the guidelines would then limit added sugars across the weekly menu.

The standards would reduce sodium limits, but that would happen gradually over several school years.

"The [US Food and Drug Administration] provided some insight and direction by suggesting that it is easier for people to accept and adopt to reduced sodium if you do it over a period of time in small increments," Vilsack said.

A gradual reduction would also give industry time to reformulate their products, said Dr. Lauren Au, an assistant professor at UC Davis' Department of Nutrition who studies the effectiveness of school nutrition programs.

The guidelines would also place a bigger emphasis on whole grains, but still leave options open for an occasional non-whole grain product.

"Maybe a biscuit can be instituted for a little variety, or grits can be provided where that may make sense from a geographic standpoint. You are sensitive to cultural demands and needs," Vilsack said.

The proposed rule would also strengthen the Buy American requirements encouraging schools to use more locally grown food.

The USDA will invest $100 million in the Healthy Meals Incentives initiative which offers farm-to-school grants and grants to buy equipment. In the 1980s, schools around the country tore out kitchens and bought prepackaged processed food. To make more nutritious meals, schools have had to rebuild or update kitchens.

"A lot of schools have outdated ovens, freezers, fridges, and that puts limitations on how they can prepare food, so grants that have helped with equipment have been really successful," Au said.

The money would also reward schools that do a good job providing nutritious meals. Grants would also be aimed at small and rural districts and training.

Vilsack said the USDA created these proposed standards after the USDA received thousands of comments and held 50 listening sessions with parents, school food administrators, the food industry, public health and nutrition experts.

"Establishing these standards are difficult because you have to follow the science you have to follow the dietary guidelines, but you also have to understand that they need to be implemented in the real world which is which is which is tough," Vilsack said in an interview with CNN.

Real world circumstances are tough already with the higher cost of food, staff shortages and supply chain problems.

Nutrition experts' first impressions

Au hasn't seen all of the proposed policies, but she said what she has seen look good.

"It's a step forward in terms of promoting healthy nutrition in schools," Au said. The reduction of added sugar, she added is a big deal.

"Reducing added sugars for this age range is so important," AU said.

Megan Lott, deputy director for the Robert Wood Johnson Foundation program Healthy Eating Research, said that the policies seem to be heading in the right direction.

"There are a couple of things we would probably like to see strengthened, but it also seems like there are plans to do that over time," Lott said.

The sugar standard is a good start, she said, but she'd prefer the proposal instead say that no more than 10% of calories should come from added sugars across the meal plan.

"But we recognize that schools might need a little bit of time for implementation," Lott said.

Lott had also hoped they would take flavored milk off the menu. Research shows that schools that have gotten rid of flavored milk show a drop in milk consumption for a year or two, but milk sales eventually rebound.

Shifting school food policies

School food has become a proverbial hot potato.

After decades of bipartisan support for school meals, the program has been politicized in about the last 10 years Lott says, meaning there is bound to be some pushback.

Friday's proposed changes would be the first large scale reform of school meal standards since President Barack Obama signed the 2010 Healthy, Hunger-Free Kids Act into law.

The law that went into effect in 2012, championed by first lady Michelle Obama, really did improve US kids' diet, studies show. The law raised the minimum standards and required schools to serve more whole grains, fruit, vegetables, and fat-free and/or low-fat milk more frequently and serve fewer starchy vegetables and foods high in trans fat and sodium.

Meals that were eaten by students -- not just served to students and then tossed into garbage cans -- were much healthier and had better overall nutritional quality, the study showed. Students who didn't participate in the national program did not see an improvement in their diets.

Despite the program's success, in 2018, the Trump administration announced a proposal to roll back many of the policies in the name of "flexibility," including ones that involved sodium and whole grains. Trump's policy would essentially create a loophole letting schools sell more burgers, pizza and french fries and reduce the fruit and vegetables sold. A federal court struck down the rule in April 2020.

During the pandemic, some of the polices were relaxed, like for whole grains, because it was difficult to find products, Lott said.

Why school meals matter

Studies show kids who eat meals at school ate more fruits, vegetables, whole grains and dairy, compared with those who ate at school less frequently.

Better nutrition can help prevent obesity. About 20% of the US population ages 2 to 19 live with obesity, which can cause kids to have high blood pressure, breathing problems and type 2 diabetes, and lead to lifelong health problems, according to the US Centers for Disease Control and Prevention.

Hungry kids have a hard time paying attention in class. Students who ate healthy meals at school scored better on end-of-year academic tests, studies have shown.

The new standards are just a proposal. The USDA will ask for additional feedback.

Vilsack is hopeful the standards will incentivize more schools to offer more healthy options.

"In terms of future of this program," Vilsack said, "we want to see more and more school districts push themselves not only to meet the standards, but in some cases to exceed them."