Healthier plant-based diets linked to modest blood pressure gains in Dutch children

Researchers in the Netherlands followed nearly 4,000 children from age 8 to 10 and discovered something modest but measurable: the kids who ate higher-quality plant-based foods had slightly lower blood pressure and cholesterol levels than their peers. The differences were small—these were generally healthy children to begin with—but they pointed in a consistent direction.

The study, part of the Generation R cohort that has tracked Dutch families since 2002, asked parents to report what their 8-year-olds ate using a detailed food questionnaire covering 71 different foods. Researchers then scored each child's diet across three measures: an overall plant-based diet index, a healthful plant-based index (emphasizing whole grains, legumes, nuts, fruits, and vegetables), and an unhealthful plant-based index (focused on refined grains, sweets, and processed plant foods). Two years later, when the children were 10, researchers measured their blood pressure, cholesterol, and other cardiometabolic markers.

The pattern that emerged was clear enough: children with higher scores on the healthful plant-based diet index had lower systolic and diastolic blood pressure. They also had lower total cholesterol. The reductions were not dramatic—these were generally well-off, relatively healthy children—but they were consistent across the group. Interestingly, all three diet indices were linked to lower total cholesterol, suggesting that even less healthy plant-based eating patterns showed some protective effect on this particular marker. The researchers also found that higher overall plant-based diet scores were associated with lower non-HDL cholesterol, though the healthful index was oddly linked to lower HDL cholesterol, a finding that complicated the picture and left questions about what it meant for actual cardiovascular health.

When researchers looked deeper into the blood chemistry of a subset of 402 children using metabolomics—a technique that measures hundreds of molecular compounds—they found 14 metabolites that differed significantly across the diet patterns. Children eating more plant-based foods showed lower levels of certain amino acids like valine and lysine. Those eating less healthy plant-based diets had reduced levels of specific phospholipids and short-chain acylcarnitines. These metabolic signatures were distinct and measurable, but the researchers could not determine whether they explained the cholesterol findings or what they meant for long-term health.

One of the study's most striking findings concerned cost. Using 2017 Dutch retail prices, researchers estimated what it would have cost to purchase the foods each child ate. Children with higher unhealthful plant-based diet scores—those eating more processed plant foods and sweets—had lower estimated food costs. A diet built around refined grains and sugary plant foods was cheaper than one centered on whole grains, legumes, nuts, and fresh produce. Healthful plant-based diets showed no clear cost association, suggesting that eating well from plants did not necessarily require spending more money, though the pattern varied. As children's healthful plant-based scores increased, a larger share of their food budget went to whole plant foods and less to animal products and processed plant foods.

The children who ate more nutritious plant-based foods tended to come from families with higher socioeconomic status, participated more in sports, and spent less time on screens. Those eating less healthy plant-based diets were more likely to have lower family income, be less physically active, and spend more time in front of screens. The study's sample overall skewed toward higher-income families, a limitation the researchers acknowledged.

What the study could not answer—and what the researchers were careful to note—was whether changing a child's diet would actually improve their health, or whether the small differences observed at age 10 would persist into adulthood and matter clinically. The diet was measured only once, at age 8. Blood samples were not fasting samples, which can affect some measurements. The cost estimates were based on a separate price database, not on what families actually spent or whether they could afford these diets. The metabolomics analysis, while revealing, involved only a small fraction of the full sample and could not establish cause and effect.

The researchers concluded that higher-quality plant-based eating was associated with modestly lower blood pressure and cholesterol in these Dutch children, but that longer-term research would be needed to understand whether these early dietary patterns predicted adult health outcomes or whether the observed differences had real clinical significance.