From feeling hungry at night to sugar cravings: 4 subtle signs of low blood sugar that should not be ignored

Glucose is a primary source of energy, but certain health conditions or situations can lead to low blood sugar which is also known as hypoglycemia-- which is when glucose levels in your blood drop below normal. This is often linked with diabetes and insulin use, but it can also affect anyone, especially people who skip meals, exercise too much, or have alcohol. Also, since glucose is a primary energy source for the brain and so having even small dips in blood sugar levels can cause noticeable changes in one's mood, appetite, and energy levels.

Unfortunately, the early signs of low blood sugar are often quite subtle and can easily be overlooked as many people dismiss them thinking it is just routine tiredness or stress. To help you decode them early on, here we list some subtle signs of low blood sugar that should not be ignored:

Do you often wake up at night feeling extremely hungry? This can be an early indicator of low blood sugar levels. When your glucose drops during sleep, your body signals hunger to restore balance. People who are diabetic often notice this, but this can also happen when a person skips dinner or eats carb-heavy meals just before going to bed. Over time, repeated nighttime hunger can disrupt one's sleep patterns, making them feeling tired the next day. To reduce such incidents, one should have a balanced dinner-- which includes protein, fiber, and healthy fats.

A 2021 study on adults with type 1 diabetes found that people with better sleep quality have significantly reduced overnight glycaemic variability-- this highlights the importance of stable nighttime glucose for sleep in this population. The study highlighted the importance of considering sleep quality in diabetes glycaemic management plans.

Having strong and persistent sugar cravings is often a subtle sign of your blood sugar dipping, and it should not be ignored in the long run. When your glucose levels fall, your body naturally demands foods that give quick energy— like sweets, snacks or processed carbohydrates. While this may give short-term relief, having sweets or processed carbs can cause instant spikes and crashes, which can worsen your blood glucose levels further. Instead, one should have balanced snacks like fruit with nuts, or yoghurt with seeds, which release energy more gradually.

A 2011 study titled 'Circulating glucose levels modulate neural control of desire for high-calorie foods in humans' in The Journal of Clinical Investigation shows that sugar cravings are closely related to fluctuating glucose levels and reward pathways in the brain, making them difficult to resist. Sustaining stable blood sugar through consistent meals, fiber intake, hydration, and quality sleep can drastically reduce sugar cravings and improve mood regulation.

A sudden feeling of dizziness or lightheadedness can indicate that your blood sugar level has dropped too low. Glucose is the main source of energy for the brain, and so even a mild shortage in blood glucose levels can affects one's concentration and balance. Many people mistakenly think it is due to fatigue or dehydration, but if you often feel dizzy or light-headed mainly after long gaps without food, then it could be due to low blood sugar. To avoid this, eat small, balanced meals throughout the day. A study by American Diabetes Association highlights that hypoglycemia impairs cognitive and motor function, increasing risks during simple daily tasks.

Since glucose is the primary source of energy for the brain, when the blood sugar becomes low, it can lead to sudden mood changes as the brain struggles to regulate mood, leading to irritability, anxiety, or sudden sadness. These change in one's emotions is often dismissed as stress, but if mood swings happen repeatedly, then it may be due to hypoglycemia. If you notice your irritability easing after eating, then that’s a strong indicator that your mood swings are due to low blood glucose. Eating regular, balanced meals helps maintain steady energy and emotional stability.

A 2020 study titled 'Glucose variability and mood in adults with diabetes' found that higher glucose level changes correlates with more mood swings--- especially in people with diabetes, impacting anxiety, sadness, and agitation. Continuous glucose monitoring linked rapid post-meal glucose increases with mood instability.