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Riverside families in the Amazon change meals as mercury poisons staple fish

LAGO DO PURUZINHO/KARIPUNA INDIGENOUS TERRITORY/CALAMA, Brazil — The Lake Puruzinho community sits on a clear, fish-rich lake in the Brazilian Amazon, an area that, at first glance, resembles paradise. Just 20 kilometers (12 miles) from the city of Humaitá in Amazonas state, the community is soundtracked by two contrasting noises: the song of birds like the crested oropendola as it flies in search of fruit, and the thunderous engines of vessels plying the Madeira River. For decades, the approximately 170 residents of the riverside community ate fish from the lake, but that changed when they learned about mercury — and discovered that large quantities of the heavy metal were being dumped into the Madeira by illegal gold mining. The river, which feeds Lake Puruzinho and is a tributary of the Amazon, receives an estimated 10-50 metric tons of mercury from dredges used in gold mining. “There was a lot of mercury in our hair [because] of the fish, the tucunaré, which we eat a lot,” says Maria Rogelina Soares da Silva dos Santos, a fisher and homemaker, at the door of her house, located on the shore of Lake Puruzinho. “It was a huge scare.” She’s referring to studies by researchers at the Federal University of Rondônia (UNIR), in which she has participated for 26 years. The research examines how mercury contamination affects fish and, ultimately, human health, focusing on pregnant women, breastfeeding women, and children in communities along the Madeira River. The studies revealed, in recent years, the presence…This article was originally published on Mongabay

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In Peru, mercury leaves a toxic footprint on those who depend on a river

MADRE DE DIOS, Peru — “Bayolet, my little daughter, had some tests when she was five years old,” says Gladys Ordoñez, a mother from the Shintuya Indigenous community, located on the banks of the Madre de Dios River, in the Peruvian Amazon. “She had already fainted twice at school, and we didn’t know why … That’s where they found mercury.” Ordoñez still remembers the group of “outsiders” who arrived a decade ago to take blood and hair samples. Weeks later, they returned to warn that the fish the community was consuming — its main source of food — could be contaminated. “We said no, that it couldn’t be,” says María Santos, another mother from the community. “We don’t mine for gold here. There is no mining here”. But its source was not in the village: Upstream, illegal gold mining was pouring mercury into the rivers that flow through the Madre de Dios region. Fish came into contact with the heavy metal and traveled downstream before reaching the plates of dozens of local families. Eleven years later, the problem persists. Little Bayolet is now 16 years old. In her fourth year of secondary school, she says she still finds it difficult to concentrate when taking lessons. According to Bayolet, her greatest wish is to finish school so she can take nursing classes. She remembers feeling constant fatigue in the classroom, along with tiredness and weakness. After her diagnosis of mercury exposure, she says she only received treatment for anemia. Bayolet was…This article was originally published on Mongabay

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Mercury threatens over 160 communities in Bolivia’s Beni River basin

BENI, Bolivia — Gilberto Vaca Muiba fears that the mercury in his body will end his life. Yet, the fear does not change his routine. He takes his old fishing rod, walks toward the river, and waits patiently for the meal of the day. He is on his knees on one of the shores of the Beni River, in the Bolivian Amazon, waiting for a fish to bite — so he can take the food home. It is a July afternoon in the Bolivian community of Puerto Yumani, and he has just caught a small surubí. The local fish is likely contaminated with mercury, but he brings it to his table nonetheless. Puerto Yumani is one of the five Indigenous communities Mongabay visited along a 41-kilometer (25.48 miles) stretch of the Beni River. The other four are Carmen Soledad and Puerto Motor, in the municipality of Rurrenabaque (in the Beni department), and Eyiyoquibo and Buena Vista, in the municipality of San Buenaventura (north of La Paz department). All these territories, belonging to the Tacana, Leco, and Ese Ejja Indigenous peoples, are exposed to mercury contamination arising in the river. Because of that, the Beni River is perceived in two ways: As a source of subsistence for the communities but also as the center of all their ills. “We eat fish every day; it is our common diet because buying meat or chicken is too expensive for us. In the rivers, we have our food, but this very food is contaminated.…This article was originally published on Mongabay

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Diet–microbiome synergy underlies obesity-associated immunotherapy efficacy

Nature, Published online: 08 July 2026; doi:10.1038/s41586-026-10750-x

Diet shapes obesity-associated therapeutic responses to immune checkpoint inhibitors through gut microbial metabolism and host anti-tumour immunity, demonstrated in mouse custom-diet models and human-to-mouse fecal microbiota transplantation experiments.
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