Medical nutrition therapy (MNT) is a therapeutic approach to treating medical conditions and their associated symptoms through the use of a specifically tailored diet devised and monitored by healthcare professionals. Evidence shows adding MNT to be significant in preventing prediabetes and managing diagnosed diabetes. MNT also prevents or slows down the complications of diabetes: Reduction of 1% A1c in patients with newly diagnosed T1DM; Reduction of about 2% A1c in persons with newly diagnosed T2DM; Medical supervision is necessary for the monitoring: Weight/BMI; glycemic parameters; metabolic parameters. MNT for prevention and treatment of T2DM and CVD has a broad range of benefits including satiety and weight stabilization; reduced low-grade inflammation; improved insulin sensitivity; improved glucose control; improved lipid profile; reduced risk of T2DM complications.