A diet heavy on cheap, modern food like instant noodles that fills bellies but lacks key nutrients has left millions of children unhealthily thin or overweight in southeast Asia, experts say.

The Philippines, Indonesia and Malaysia have booming economies and rising standards of living, yet many working parents do not have the time, money or awareness to steer clear of food hurting their kids.

In those three nations, an average of 40 percent of children aged five and below are malnourished, higher than the global average of one-in-three, according to a report out Tuesday from UNICEF, the UN children’s agency.

“Parents believe that filling their children’s stomach is the most important thing. They don’t really think about an adequate intake of protein, calcium or fibre,” Hasbullah Thabrany, a public health expert in Indonesia, told AFP.