What is a risk of evening exercise for patients using insulin?

• A. It may trigger hypoglycaemia during sleep.
• B. It significantly improves daytime energy.
• C. It leads to permanent weight gain.
• D. It has no effect on glucose levels.

Answer: (A)

Evening exercise can lower blood glucose more than usual because muscles use glucose during activity and insulin sensitivity stays higher for several hours afterward. For someone on insulin, this combination can cause glucose to drop too far, potentially during sleep, leading to nocturnal hypoglycemia. That risk is why this option is the best answer.

Other statements don’t fit the risk concept: while exercise can improve daytime energy, that’s a benefit rather than a risk; permanent weight gain isn’t a typical result of exercising in the evening for someone on insulin; and it’s not accurate to say exercise has no effect on glucose levels, since activity markedly influences glucose and insulin needs.