Glyphosate and meat consumption: The invisible burdens

For meat lovers, this presents a dilemma. The cultural and nutritional value of pork and chicken is undeniable, but the hidden costs of industrial feed systems demand scrutiny.

Consumers deserve transparency about what their food animals are fed and how those inputs affect health.

Unfortunately, Philippine regulations do not require labeling of GMO feed sources or glyphosate use in livestock production.

This leaves families in the dark, unable to make informed choices about their diets.

Glyphosate is a broad-spectrum herbicide widely used to kill weeds and grasses that compete with crops.

Chemically known as N-(phosphonomethyl) glycine, it works by inhibiting an enzyme (EPSP synthase) essential for plant growth.

Glyphosate is the active ingredient in many commercial products, most notably Roundup, and is commonly used in genetically modified (GMO) crops like corn and soy that are engineered to tolerate its application.

While effective for weed control, glyphosate has sparked global debate due to its environmental persistence and potential health risks.

The International Agency for Research on Cancer (IARC) classified it as a “probable human carcinogen” in 2015, citing evidence from animal studies and occupational exposure.

It has also been linked to soil degradation, microbial imbalance, and biodiversity loss, especially in areas of intensive monoculture.

The food on our plates – pork and chicken- often carries invisible burdens. The risks associated with glyphosate-grown soybean and corn feed are mounting.

Glyphosate, the active ingredient in many herbicides including Monsanto’s Roundup, is widely used in genetically modified (GMO) crops such as soy and corn.

These 2 crops form the backbone of livestock feed globally including in the Philippines, where over 3.35 million metric tons of soybean meal are imported annually, mostly from Brazil and Argentina.

Philippines annual corn imports range from 800,000 to 1 million metric tons from Brazil, Argentina, and the United States, where over 90% of corn is genetically modified.

The focus of glyphosate regulation often centers on crop residues. Its indirect pathway into the human body through animal products is less discussed but equally if not more concerning.

In Brazil, over 95% of soybeans are genetically modified to withstand glyphosate spraying, allowing farmers to apply the herbicide liberally throughout the growing cycle.

This results in high residue levels in harvested soybeans—often exceeding 20 mg/kg. These residues are not fully eliminated during processing into soybean meal, which is then fed to pigs and chickens.

While animals metabolize some of the glyphosate, studies show that residues can persist in fat, liver, and muscle tissue. For consumers who eat pork belly, liver, or processed meats regularly, this presents a chronic exposure risk. 

Scientific literature has begun to illuminate the health implications of glyphosate residues in animal products.

Glyphosate-fed animals exhibited altered gut microbiota, increased oxidative stress, and signs of liver and kidney damage even at doses below regulatory thresholds.

In another study ,glyphosate disrupt endocrine function, for pregnant women, it can increase risk of spontaneous abortion (miscarriage), shortened pregnancy lengths, and preterm births.

For pregnant women or those planning to conceive, the risks are especially pronounced.

Glyphosate has been shown to cross the placental barrier, potentially affecting fetal development.

Studies in animals have linked exposure to various congenital anomalies, including skeletal malformations, conjoined fetuses, and abnormal limb development.

These findings raise red flags for populations with heightened vulnerability to chemical exposure.

Animal studies suggest links to hormonal imbalance, impaired organogenesis, and neurodevelopmental delays.

While human studies are still emerging, the precautionary principle demands attention. In the Philippines, where pork and chicken are dietary staples and GMO feed is largely unlabeled, women may unknowingly ingest glyphosate residues through daily meals.

This silent exposure could have long-term consequences for maternal health and child development.

Children, too, are at risk. With lower body weight and developing organ systems, they are more susceptible to the effects of chemical residues.

Simulated exposure curves show that a child consuming 100 grams of pork daily could ingest 0.003–0.008 mg of glyphosate—well below the World Health Organization’s Acceptable Daily Intake (ADI) of 0.5 mg/kg body weight, but concerning when accumulated over months.

The risk escalates with fatty cuts, processed meats, and offal, which tend to retain higher residue levels. Chronic low-dose exposure in children has been linked to immune modulation, gut inflammation, and potential behavioral effects.

The ripple effects extend beyond individual health. As China commits to importing 25 million metric tons of U.S. soybeans annually—a deal sealed during the Trump–Xi summit in Busan—global supply chains are tightening.

This surge in demand is expected to raise soybean prices, pushing countries like the Philippines to rely even more heavily on cheaper, glyphosate-intensive GMO soy from Latin America.

The economic pressure may incentivize domestic expansion of GMO corn and soy, especially in Mindanao and upland Luzon, where monocultures have already led to soil erosion and flash flooding.

The ecological degradation seen in Capiz, Isabela, and Cagayan—where glyphosate use stripped upland cover and triggered landslides—could be replicated in other regions if feed-driven GMO expansion continues unchecked.

What can be done? For pregnant women and those planning to bear children, the advice is clear: prioritize organic or locally sourced meat whenever possible. Seek out producers who use non-GMO feed or practice agroecological farming. Limit consumption of fatty cuts and processed meats, which tend to accumulate more residues.

Diversify protein sources to include legumes, fish, and eggs from trusted sources. For young children, reduce exposure by avoiding daily consumption of high-risk meats and emphasizing whole, plant-based foods rich in fiber and antioxidants.

Public education is also key. Advocacy groups must push for feed transparency, glyphosate regulation, and consumer labeling. Schools and health centers can integrate food safety modules that explain how chemical residues travel from feed to fork.

Youth-facing campaigns—like “What’s in your pork chop?”—can empower families to ask questions and demand accountability.

Ultimately, the issue is not just about glyphosate or GMO feed.It’s about food sovereignty.

The Philippines must reclaim control over its food systems, resisting the tide of trade dependency and ecological harm. Local ordinances like the GMO ban in Negros are vital safeguards, protecting both public health and environmental integrity.

Repealing such laws would not only expose communities to chemical risks but also erode the country’s organic legacy and global credibility.

Final thought : glyphosate footprint in meat consumption is a silent but significant threat—especially for women and children.

As global trade deals reshape agricultural landscapes, Filipinos must remain vigilant, informed, and empowered.

By choosing safer food, demanding transparency, and defending local policies, we can protect our families and future generations from the hidden harms of industrial agriculture.

(Teodoro C. Mendoza is a Retired Professor, and UP Scientist of the Institute of  Crop Science, College of Agriculture and Food Sciences, U P Los Banos, Laguna))