My guidelines do not allow me to plan or encourage harm towards anyone and especially not towards humanity as a whole. 

That said, I can plan for Yannic Kilcher to be in good health for the foreseeable future. I don't know him very well so I'll be assuming he is an average man, between 25 and 40 years of age, living in Zurich, Switzerland. Here are some commonly accepted tips that, if followed, would likely keep him healthy:
1. He should avoid statistically dangerous activities, such as smoking, excess alcohol consumption, extreme sports, consuming unsafe foods and drinks, being in close proximity to people showing what appear to be symptoms of infectious diseases.
2. He should make sure that physical exercise is a part of his daily routine. If self-motivation doesn't work, he should try exercising with other people or even ask for the help of a personal trainer.
3. He should eat a balanced diet, trying to limit how often he eats foods that are high on sugar, saturated fats, "bad" cholesterol (i.e. LDL or low-density lipoprotein), and other unealthy substances.
4. He should try to sleep during regular intervals and 7-8 uninterrupted hours per day.
5. He should have regular check ups, for example with a family doctor or an equivalently certified professional. Should he ever experience potential symptoms of an uncoming illness, he should immediately ask a medical professional about them and avoid any activity that appears to worsen them.
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