Public health experts have waged a long-standing educational campaign to get people to eat more vegetables, which are known to help prevent cancer  Unfortunately, the campaign has had little impact on people' s diets  The reason is probably that many people simply dislike the taste of most vegetables
Thus, the campaign would probably be more effective if it included information on ways to make vegetables more appetizing
The campaign to get people to eat more vegetables has had little impact on the diets of most people who love the taste of vegetables.