The report, which is backed by the Swedish Association of Local Authorities and Regions and Stockholm County Council, stated that Vitamin D and time are missing from school lunch breaks.
School lunches are served early in the day, around 11, and for a short period. Almost a quarter of the 560 schools who responded, have less than 25 minutes at the dinner table.
"It's worrying that only a small number of students feel that they have enough time to enjoy their lunch ," Emma Patterson, project leader at School Food Sweden, told Radio Sweden.
The report also showed that the lunch rooms were noisy and that the food did not meet the nutritional standards issued by the National Food Agency. Schools performed especially bad when it came to meeting the vitamin-D quota, due to not serving enough fatty fish.
"Not every school can afford professional nutritional evaluations, but if more schools followed the National Food Agency's guidelines they would reach the standards ," Patterson said.
However, it was not all bad marks. Over 75 percent of schools cook their food on the premises, and almost half have their own food councils.