In consideration of your father's current health conditions, it is best that he should consult his doctor and/or another licensed medical profesional. Your doctor can refer your father to a registered dietitian who will be able to work with your father more closely to discuss what specific foods can help him manage his blood pressure and blood glucose levels.
Eating a balanced diet of fresh, whole foods is a very important part of being healthy, but there are other things that are also important. Check out our Lifestyle pages for tips on general nutrition, physical activity and more! Here a few you may find helpful:
Thanks for your question. I hope this helps!