Final answer:
Spinach is typically highest in magnesium, followed by whole-wheat bread, yogurt, and bananas having the least amount.
Step-by-step explanation:
To rank the following food sources from highest to lowest in magnesium content, we can refer to general nutritional information about these foods. Generally, dark green leafy vegetables such as spinach are very high in magnesium, followed by whole grains, then dairy products like yogurt, and fruits such as bananas, which tend to have lower magnesium content compared to the aforementioned foods.
- Spinach, 1 cup
- Whole-wheat bread, 1 slice
- Plain yogurt, 1 cup
- Banana, 1 medium
It is important to note that the actual magnesium content can vary based on specific brands and preparations, so this ranking is based on typical magnesium content for these types of food.