Although insulation standards have been increasing, so has the standard of home heating. In 1970, only 31% of homes had central heating. By 2003 it had been installed in 92% of British homes, leading in turn to a rise in the average temperature within them (from 12.1 °C to 18.20 °C). Even in homes with central heating, average temperatures rose 4.55 °C during this period.
We’re mammals, much of our energy expenditure is on regulating body temperature.
It would actually be fascinating to work out what the change in the average – per human and internally – energy budget is as a result of the above. My intuition (that is, some wild half assed guess I can’t possibly support with evidence) is that our energy intake in the form of food hasn’t fallen as fast as the energy required, as a result of central heating, to regulate body temperature.
Thus a nation of tubbies because of the widespread existence of radiators.
So, anyone actually know enough about kcals to be able to work this out?