One only has to look at a picture of President Obama to see that the pressure of being a world leader has taken a toll on him physically. A new study was published in the British Medical Journal, which reveals the impact of pressure on world leaders. The researchers surveyed over 279 federal leaders and 261 candidates who tried but didn't make it into the office. The results, "Elected leaders lived 2.7 years less and had a higher risk of death compared with the runners-up. So being head of state was associated with dying younger." So while the winner gets the power, the residence, the clout, the fame, the plane, the chef, the military, etc., the loser gets almost three more years of life.

Source:

Julia Belluz, “It’s not an illusion. Being president really can age you more quickly,” Vox (12-15-15)