Dietitian Tseng Chien-ming highlights the risk of overweight children lacking essential nutrients, emphasising that a focus on weight alone overlooks critical dietary quality issues that impact growth and immunity.
Childhood obesity can mask a quieter problem: a child may be getting too many calories and still not enough essential nutrients. That is the warning from dietitian Tseng Chien-ming, who argued that parents often focus on weight alone and overlook the quality of what children actually eat. In his view, the real question is not simply whether a child is eating too much, but whether the diet is varied enough to support growth, immunity and development.
Tseng pointed to a recent systematic review and meta-analysis of Mexican children and adolescents that examined 16 studies covering 20,043 participants. The analysis found that overweight or obese children were more likely to have vitamin D deficiency, with the strongest signal seen among school-age children. It also flagged possible shortfalls in zinc, iron and vitamin B6, while evidence for calcium, magnesium, phosphorus and vitamin E was less consistent. Researchers said the findings reflect a broader pattern in which excess weight and micronutrient deficiency can coexist.
That problem is not limited to Mexico. Taiwan’s National Health Interview Survey for 2017 to 2020 showed that 26.7% of children aged 7 to 12, 30.6% of those aged 13 to 15 and 28.9% of those aged 16 to 18 were overweight or obese, or roughly one in three young people overall. Tseng also noted long-running domestic nutrition data showing persistently low calcium intake, and earlier surveys of primary, middle and high school students have found that many do not meet recommended calcium levels.
The concern is not that every overweight child is automatically nutrient-deficient, but that poor diet quality can allow both problems to develop at once. Tseng said a child can consume plenty of sugary drinks, fried foods, biscuits and refined starches and still fall short on dairy, fish, beans, vegetables and fruit, especially if outdoor activity is limited. He said the response should not be crash dieting or routine supplement use. Vitamin D supplementation in overweight and obese children has been studied, but recent reviews found only modest rises in vitamin D levels and unclear effects on metabolic outcomes, which is why experts recommend tailoring supplements to dietary assessment and clinical testing rather than guessing.
His wider point is that childhood obesity prevention cannot rest on the child alone. Home food choices, school meals, safe places to move and screen time all shape what children eat and how active they are. Public health agencies such as the US Centers for Disease Control and Prevention and the World Health Organization both describe obesity as a major, preventable health problem that requires changes in diet, activity and the wider environment. For Tseng, the aim should be steady growth with a healthier body composition, not just a smaller number on the scale.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
