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School lunch programmes were originally designed primarily to ensure that children from low-income households received at least one nutritious meal per day, but their scope has gradually expanded in many countries to serve broader public health goals. Some jurisdictions now mandate minimum nutritional standards for all school meals, regardless of a student's income, in an effort to combat rising rates of childhood obesity. Critics argue that stricter standards sometimes lead to food waste, as students discard unfamiliar or less palatable healthy options rather than eating them. Proponents counter that repeated exposure to healthier foods gradually shifts children's preferences over time, even if initial uptake is low.