The phrase "bad dietary habits" refers to unhealthy or poor eating patterns that can have negative consequences for an individual's health. This may include consuming excessive amounts of certain foods, such as those high in sugar, salt, or saturated fats; not getting enough essential nutrients from a balanced diet; and engaging in habits like skipping meals, binge eating, or overeating. These behaviors can lead to weight gain, chronic health conditions such as heart disease, high blood pressure, type 2 diabetes, and other health issues.