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And, consider cutting back on butter.   Health Rounds Health Rounds By Nancy Lapid , Health Science Editor Hello Health Rounds readers! In the latest evidence of health risks from plastics in the environment, researchers have found microplastics may help bacteria become resistant to antibiotics. We also report on a large study that suggests decreasing butter in diets can lower mortality risks, and a report that further links wildfire smoke exposure and skin problems.   In breaking news, see these stories from our Reuters journalists:  Utah poised to become first state to ban fluoride in public water system ; US FDA to hold off action on weight-loss drug copies pending court ruling ; Nigeria steps up fight against Lassa fever outbreak after 98 deaths this year ; WHO starts slimming down in response to US cuts; and countries, global health groups b...

Zhengzhou Exchange on Tuesday raised the trading margin requirements for some rapeseed meal futures contracts to 9% from 7% after Beijing's 100% tariff on Canadian imports triggered a two-day rally that pushed prices to a five-month high.   Reuters Business Reuters Business   China tightens trade rules as Canadian tariffs spark price volatility     Trump's tariffs create the 'Wild West' on Wisconsin's factory floors     Morning Bid: Wall Street's epic swoon wipes out Trump bump     American Airlines forecasts bigger first-quarter loss     Musk's Starlink internet to make India debut with Bharti Airtel     Kohl's downbeat annual sales forecast sends shares tumbling 17%     Southwest A...