Fast food can be harmful due to high saturated fat, calories, and sodium. However, some options from popular chains like Ruby Tuesday, Rostiks, and McDonald's can be healthier choices if modifications are made, such as removing cheese or bacon. The top 5 most dangerous fast food items are identified as having very high fat, saturated fat, sodium, and calories content while being low in fiber. Moderation is key when consuming fast food occasionally rather than abuse.