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Good sources of potassium include: potatoes, sweet potatoes, bananas, tomato sauce (without added salt or sugar), orange juice, tuna (fresh, frozen or tinned, but avoid tuna packed in brine), yoghurt and fat-free milk.ow to eat more potassium to lower blood pressure. Fruit and vegetables are full of vitamins, minerals and fibre to keep your body in good condition. They a great source of potassium, which helps to balance out the negative effects of salt and lower your blood pressure.
Low levels of potassium can cause sodium sensitivity and an increase in blood pressure. Potassium also affects insulin levels. When potassium levels are low, there is a reduction in insulin secretion. A very low level of potassium causes a condition called hypokalemia.