Who to believe?

If you believe the government, the chances of our children living as long as us is not certain. For example, according to the Department of Health,

Obesity is associated with many illnesses and is directly related to increased mortality and lower life expectancy. Tackling obesity is a government wide priority.

But how should we reconcile this with the information coming out of the Pensions industry. See two recent reports in the FT, Companies face up to the real cost of pensions and Proposals to add pressure on pension funding. The evidence is that we are all living longer, and will go on doing so (pace the Department of Health).  What perhaps concerns the government is that illness will not kill us so quickly, so the cost to the next generation will be greater.