Research from the Harvard T.H. Chan School of Public Health highlights that child hunger, including "zero-food" cases among toddlers, causes devastating, long-term physical, cognitive, and emotional damage. Hunger induces severe stress, impairs brain development, limits educational achievement, and increases risks for lifelong chronic illnesses and mental health disorders.

Key findings regarding the devastating effects of child hunger include:

• "Zero-Food" Children: A Harvard-led study found up to 21% of children aged 6–23 months in some countries went without any food or formula in 24 hours, with 10.4% affected across 92 countries.

• Irreversible Brain Development Damage: Chronic undernutrition during early childhood changes the neurological architecture of the brain, leading to permanent cognitive impairment.

• Severe Health Consequences: Hunger is linked to stunted growth, weakened immunity, cardiovascular disease, obesity, and type 2 diabetes.

• Mental and Behavioral Impacts: Hungry children suffer from increased psychological stress, emotional instability, poor concentration, and lower academic achievement.

• Intergenerational Impact: The Center on the Developing Child at Harvard University notes that early adversity, including malnutrition, contributes to the intergenerational reproduction of inequality.