Final answer:
Magnesium is an essential nutrient that should be adequately consumed when following the DASH diet, as it supports various critical bodily functions. The correct option is 1.
Step-by-step explanation:
When following the DASH diet, an essential nutrient to ensure adequate intake of is magnesium. This diet emphasizes the importance of consuming nutrients needed for various bodily functions, including magnesium. Magnesium aids in blood pressure regulation, muscle and nerve function, and the maintenance of a steady heart rhythm.
It is also essential for a strong immune system and bone health. The DASH diet recommends consuming a balance of foods to ensure that all essential nutrients are met without overconsumption of any single nutrient.