Is it possible to lower blood pressure with diet?

Yes!! Diet can effect blood pressure in several ways. Many people are "salt sensitive" meaning that higher sodium foods and a high sodium diet disproportionately raises there blood pressure. Subsequently lowering dietary sodium will reduce it. Any loss of weight can help reduce blood pressure independent of other factors, and a low calorie diet is the key to weight loss.
Oh yes. Stop high carb foods (grains, lentils, potato based items). Also avoid milk protein since it causes insulin resistance that eventually raises BP. Low carb food items such as flesh foods, eggs, non starchy vegetables, avocados, saturated fat (butter, ghee, coconut oil), olive oil are very effective. Get some sunshine daily. For more, go to: