Background: Recently published work and emerging research efforts have suggested that the olfactory system abilities is intimately affected by morbid obesity. Morbidly obese patients demonstrate altered olfactory acuity. High body mass index (BMI) appears to be associated with olfactory dysfunction. Increasing BMI may be a risk factor for olfactory loss or lack of olfactory recovery after an inciting event. Objective: This study aimed to discuss olfactory impairment in obese patients and to elucidate what role olfactory loss may play in diet and feeding habits of obese patients Conclusion: Our study presented a strong evidence for a causal relationship between changes in olfactory abilities of obese patients. There was altered olfactory acuityand cardiovascular, inflammatory, and cognitive declines. It was found that consumption of diets high in fat are found to cause nervous system dysfunction.