Final answer:
The most effective way to substantially increase the calcium content of the meal is by replacing the cola with milk, which is rich in calcium.
Step-by-step explanation:
Increasing Calcium Content in a Meal
The calcium content of the meal described can be substantially increased by replacing the cola with milk. Milk is a well-known source of calcium, providing approximately 0.2 grams per 100 milliliters. Dairy products like milk are not only primary sources of calcium but also are recommended as part of a balanced diet following the guidelines of MyPlate, which suggests including a serving of a dairy product with each meal. Other good sources of calcium include cheese, green leafy vegetables, almonds, and canned fish with soft bones like sardines and salmon. Therefore, while some of the other options may contain calcium, the substitution of cola with milk would result in the most significant increase in calcium for the meal.