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PURPOSE This study investigated changes in food and nutrient intake after implant-supported fixed prosthesis treatment in patients with partial edentulous posterior regions. METHODS This study included 30 patients who received implant treatment with fixed prostheses in the posterior region. Food and nutrient intake was evaluated using a brief self-administered diet history questionnaire at baseline and post-implant treatment, and the results were statistically analyzed. RESULTS Treatment with implant-supported fixed prostheses in patients with posterior edentulous conditions tended to increase the amounts of soy products and vegetables consumed: in particular, intake of carrot and squash was significantly increased. The total energy, protein, lipid, and carbohydrate intakes were comparable between baseline and post-implant treatment. On the other hand, the vegetable protein, α-carotene, daidzein, and genistein intakes were significantly increased, and dietary fiber and β-carotene intakes tended to be increased in patients with implant-supported fixed prostheses. CONCLUSIONS Implant-supported fixed prostheses in patients with posterior edentulous conditions affected food intake, resulting in improved nutrient intake.