Final answer:
The statement that 'processed foods are a major source' (option a) of potassium is NOT true, as processed foods typically have higher sodium levels and less potassium compared to whole foods like fruits, vegetables, and legumes.
Step-by-step explanation:
The question 'Which of the following is NOT among the features of potassium in nutrition?' addresses various sources of potassium in our diet and asks which statement is not true regarding potassium's role and sources in nutrition. The correct answer to this question is that, 'processed foods are a major source,' is NOT among the features of potassium in nutrition. Although processed foods can sometimes have added potassium, they are generally not considered a major source of potassium when compared to whole foods like fruits and vegetables, legumes, fish, and meat that naturally have higher levels of this essential mineral. In fact, processed foods often contain higher amounts of sodium, which can disrupt the balance of sodium and potassium in the body, leading to potential health issues.