Signs of an unhealthy diet include excessive consumption of processed foods, high sugar intake, and insufficient fruits and vegetables. Poor dietary habits may lead to weight gain, fatigue, and nutrient deficiencies. Common indicators also include frequent indigestion, skin issues, and low energy levels. An unhealthy diet can increase the risk of chronic diseases, such as diabetes and heart disease. Recognizing these signs is crucial for making informed dietary adjustments that contribute to overall health and well-being.