Cancer is uncontrolled growth of cells that go wild in the body. It could be inherited or from exposure. The way you live your life – the foods you eat, the amount you move your body, the air you breathe, and the sleep you get – all play a role in how your cells grow, divide, or breakdown.
Obesity definitely plays a role. Anything that causes significant stress on the body can cause the body’s immune system to malfunction. This malfunction can bring on auto-immune disease which by itself can cause cancer. Stress can also affect your sleep and lack of sleep has been shown to cause several cancers (see NIH for details). Pollution and environmental stressors like so many of you have already said also play a role in cancer diagnosis.
We also have screening tools that can catch cancers much earlier than before so that also plays a role on why younger people are being diagnosed more frequently.
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