What is the greatest concern during exercise with a person who has diabetes mellitus? Ketosis. Hyperglycemia Hypoglycemia Dehydration.

The greatest concern during exercise with a person who has diabetes mellitus is Hypoglycemia.

Here's why:

1. Exercise increases the body's demand for energy. In response, the body increases the rate at which it breaks down glucose, the body's primary source of energy.

2. In people with diabetes, this process can be disrupted. Insulin, the hormone that regulates glucose breakdown, may not be produced in sufficient amounts or may not be used effectively. This can lead to high levels of glucose in the blood, a condition known as hyperglycemia.

3. However, during exercise, the body can also use up glucose more quickly than it is produced or released from storage. This can lead to low levels of glucose in the blood, a condition known as hypoglycemia.

4. Hypoglycemia can be dangerous, causing symptoms such as shakiness, dizziness, confusion, and in severe cases, loss of consciousness. It can occur during exercise, immediately after exercise, or even up to 24 hours after physical activity.

5. While hyperglycemia, ketosis (a state where the body starts breaking down fat for energy because it doesn't have enough insulin to use glucose), and dehydration are also potential concerns during exercise in people with diabetes, hypoglycemia is often considered the greatest concern because of its potential to occur quickly and its serious health risks.

Therefore, it's important for people with diabetes to monitor their blood glucose levels before, during, and after exercise