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An estimated 480,000 Dutch strength and combat athletes use anabolic steroids to grow their muscles. Researchers warn of the many health risks. Ghent professor Peter van Eenoo says: 'The most important muscle in our body is the heart. And while proverbially having a big heart is a good thing, if you look at it purely physically, that is not the case. A big heart involves risks. It can lead to heart failure, to a heart attack.' Watch the entire broadcast on NPO Start under 'Focus'. On ntr.nl/wetenschap you will find the best science stories from the NTR. We follow the developments in science with a critical eye and keep you informed of the latest science news, new programs and fun facts. Follow us on Twitter: / wetenschap Follow us on Facebook: / ntrwetenschap Follow us on Instagram: / ntrwetenschap