Youths should learn to balance hard work with a healthy diet, proper sleep and timely exercise, doctors said while cautioning that overwork is leading to early onset of lifestyle diseases. Some medical experts also said that a 70-hour-week regimen would be "far too ambitious," and urged team leaders at workplaces to divide work in an optimised manner among members and "not try to extract too much work from an individual", which often leads to physical or psychological burnout. Their comments come in the wake of Infosys co-founder N R Narayana Murthy recently suggesting that young people should work 70 hours…