Fat-soluble vitamins, such as vitamins A, D, E, and K, are crucial for maintaining various bodily functions, including metabolic processes and immune system health. However, in individuals with obesity, the levels of these vitamins may be lower due to their tendency to be stored in fat tissue rather than circulating in the bloodstream. Vitamin D, in particular, is associated with better fat metabolism and may play a role in preventing obesity. Low levels of vitamin D have been linked to increased fat storage and insulin resistance. To support weight management, individuals with obesity should focus on improving their intake of fat-soluble vitamins through nutrient-dense foods such as leafy greens, fish, and fortified products, or through supplementation when necessary. Ensuring adequate levels of these vitamins may improve metabolic health and reduce obesity-related risks.