Keeping track of what your program is doing is the only way to discover if it’s actually working.
Evaluating each strategy in the program will allow you to see if it is contributing towards your goals and objectives. This might be as simple as asking participants how they are going, or monitoring participation rates for larger ongoing activities. Ultimately, there is no point wasting resources on strategies that are not achieving your goals.
Your evaluation process may also show you some benefits you weren’t expecting. Maybe you didn’t reach your specific goal around daily fruit and vegetable intake, but you find that more employees are satisfied with the food provided in the on-site cafeteria, or they are more aware of healthier food options available close by.