Fast foods are quick and easy substitutes for home cooking. But fast foods are almost always high in calories, fat, sugar, and salt.
Some restaurants still use hydrogenated vegetable oils for frying. These oils contain trans fats. These fats increase your risk for heart disease. Some cities have banned or are trying to ban the use of these fats.
Now, many restaurants are preparing foods using other types of fat. Some offer low-calorie choices instead.
Even with these changes, it is hard to eat healthy when you eat out often. Many foods are still cooked with a lot of fat. Many restaurants do not offer any lower-fat foods. Large portions also make it easy to overeat. And few restaurants offer many fresh fruits and vegetables.
In general, people with high blood pressure, diabetes, and heart disease must be very careful about eating fast food.