There are many synonyms for the phrase "bad for you." Some alternatives include unhealthy, detrimental, harmful, toxic, damaging, perilous, deleterious, and injurious. These words all convey the idea that something is not good for your well-being and could potentially cause negative health effects. Other possible synonyms include dangerous, hazardous, risky, and unsafe, which imply that an activity or substance could pose a threat to your physical or mental health. Whether you're talking about food, habits, or certain behaviors, using synonyms for "bad for you" can help emphasize the potential risks and encourage healthier choices.