Nutritional assessment, intervention, and result evaluation are all influenced by changes in nutritionrelated behaviour. The combination of medical nutrition therapy and behaviour modification is supported by evidence-based medicine. The evidence is compelling in those with type 2 diabetes and obesity. When compared to CBT self-monitoring, meal replacements, and/or organised meal planning, motivational interviewing was found to be the most superior and highly effective counselling technique. Although goal-setting, problem-solving, and social support are useful tactics, further research in more diverse populations are required. We will focus on increasing adherence to medical nutrition treatment with behaviour modification in this review of the literature.