A population's medical need represents its illness burden. Medical dem
and represents the service level requested for a particular need. Medi
cal care costs are, in large part, a function of need and demand. Our
review of health education programs designed to reduce health risks an
d reduce costs identified thirty-two programs with documented effectiv
eness, generally achieving claims reductions of 20 percent. Specific p
rogram features including chronic disease self-management, risk reduct
ion, and increased self-efficacy appear important. A broadened definit
ion of health promotion focused on increased personal responsibility f
or health-related actions and directed at improvement of long-term hea
lth outcomes also could reduce health care costs.