What symptom is indicative of the need for magnesium supplementation during pregnancy?

Leg cramps are a common symptom during pregnancy, especially in the later trimesters, and they can be indicative of magnesium deficiency. Magnesium plays a crucial role in muscle function, and its deficiency can lead to muscle cramps and spasms. Supplementing with magnesium can help alleviate these cramps and promote relaxation of the muscles.

Frequent headaches may be related to various factors such as hormonal changes, dehydration, or tension, but they are not specifically linked to magnesium deficiency. Bloating is often a result of hormonal changes and digestive adjustments during pregnancy rather than a direct indication for magnesium supplementation. Low energy levels can stem from a range of causes including anemia, sleep disturbances, and general fatigue associated with pregnancy; while magnesium is involved in energy metabolism, it is not as directly correlated with low energy levels as it is with leg cramps.