From the food on our tables to the water in our taps, everyday exposure to agricultural chemicals is reshaping how children grow. New scientific research shows that common fungicides and insecticides can alter the delicate timing of puberty in girls.
The good news? While environmental toxins are hard to avoid entirely, understanding how they work gives parents clear, practical ways to reduce daily risk.
In the early 1900s, physical changes associated with puberty usually started around age 14 or 15. Today, those same changes frequently begin between ages 8 and 10.
This long-term trend has raised concerns among doctors, scientists and parents.
The body's endocrine system, a collection of glands that produce hormones, controls when and how puberty begins, guiding a young person's physical development and sexual maturation.
Although a person's DNA plays a large role in the timing of this transition, external influences can shift when it occurs.
Scientists increasingly find that a combination of everyday habits, diet and hormone-disrupting chemicals in the environment can interfere with natural signals and alter this biological timeline.
A breakthrough study
To better understand how environmental pollution influences pubertal development, a research team from the ibs.GRANADA Biosanitary Research Institute and the University of Granada in Spain published a groundbreaking study in the journal "Environmental Research".
Conducted through the broader INMA Project (Childhood and Environment), the study tracked 506 Spanish girls across four different regions of Asturias, Gipuzkoa, Sabadell and Valencia.
Between 2013 and 2016, when the participants were 7 to 10 years old, researchers collected and tested urine samples to measure early exposure to agricultural pesticides.
The team then followed these girls until they reached ages 14 to 16 to record the exact date of their first menstrual period.
By comparing the concentrations of pesticide metabolites found in early childhood urine samples against the exact timing of first menstruation, the study provided concrete data on how early chemical exposures intersect with biological milestones.
Opposite effects
By analysing childhood urine samples alongside pubertal tracking, the research team discovered that different agricultural pesticides interact with the body in distinct ways.
Fungicides accelerated the first menstrual period: Higher levels of ethylenethiourea (ETU), a residue from dithiocarbamate-type fungicides, were tied to an earlier onset of first menstruation. Scientists suggest that because ETU acts as an antithyroid agent, it disrupts thyroid hormone balance, which can then speed up reproductive development.
Insecticides delayed the first menstrual period: Higher presence of TCPy, a breakdown product of the organophosphate insecticide chlorpyrifos, was associated with a delay in first menstruation. This delaying effect was especially pronounced in girls who were overweight or obese, demonstrating that chemical toxicity interacts closely with body fat and metabolic health.
What the experts say
Because pesticides are heavily applied in conventional agriculture, food and drinking water serve as primary pathways for chemical exposure in children.
Lead researchers and environmental health specialists emphasise that while these findings provide valuable real-world evidence, they must be viewed within a broader scientific context.
"These findings highlight the importance of endocrine disruptors in children's health and underscore the need for further research into their effects. While the results are pioneering, they should be interpreted with caution until confirmed across other diverse populations," said the research team at the University of Granada & ibs.GRANADA
Expert endocrinologists also point out that alterations in pubertal timing carry real health consequences.
Reaching puberty too early is linked to higher rates of psychological stress during adolescence, as well as an increased risk of developing hormone-dependent conditions, such as breast cancer, later in adult life.
Reducing exposure
Reducing exposure to agricultural pesticides and endocrine-disrupting chemicals (EDCs) in everyday food involves combining effective home preparation techniques with smart shopping strategies.
While it is nearly impossible to eliminate chemical exposure entirely, evidence shows that several targeted actions can significantly lower your daily intake.
Tips for washing and preparing your food
How you wash and prepare food directly impacts surface chemical residue.
1. Research shows that a 1 to 2% baking soda solution breaks down surface pesticides significantly better than water alone. Mix 1 teaspoon of baking soda with about 2 cups of water. Submerge produce like apples, grapes or berries for 10 to 12 minutes, then rinse thoroughly under cold running water.
2. Rubbing fruits and vegetables under cold running water works better than dipping or soaking them in stagnant water. For firm produce like root vegetables, potatoes or melons, scrub with a produce brush.
3. Peel fruit skin like apples, cucumbers and peaches when practical. Systemic pesticides that have absorbed into plant tissues cannot be washed off, but peeling removes the highest concentration of surface wax and residues. For leafy greens like lettuce and cabbage, discard the outermost leaves where pesticide spray accumulates.
4. Many fat-soluble pesticides and environmental pollutants accumulate in the fatty tissues of animals. Trimming visible fat from meat, removing skin from poultry and fish and choosing lean cuts helps limit exposure to bioaccumulated compounds.
5. Diversify your diet. Rotating the types of grains, vegetables and fruits you consume prevents overexposure to any single class of pesticide or agricultural chemical.
alyssia.birjalal@nationalmg.co.za