That tired, shaky feeling after eating something very sweet can seem to come out of nowhere. A meal or snack high in rapidly digested carbohydrates can cause blood glucose to rise quickly, followed by a drop that may leave some people feeling drained.
A so-called sugar crash can involve fatigue, hunger, irritability, headaches, shakiness, dizziness or difficulty concentrating. Not everyone experiences these symptoms, and feeling sleepy after a meal does not necessarily mean your blood sugar has fallen dangerously low.
One reason these swings can happen is the body’s response to rising blood glucose. After eating carbohydrates, the pancreas releases insulin, which helps move glucose from the bloodstream into cells. The size and speed of this response can vary depending on the meal, the person and other factors.
The good news is that what you eat alongside carbohydrates can make a difference. Meals containing protein, fiber and healthy fats generally digest more slowly and can help provide steadier energy than eating a large amount of refined carbohydrates on their own.
For example, instead of having a sugary snack by itself, pairing it with a source of protein or fiber can make the snack more filling and may reduce a rapid rise and fall in blood glucose. Nuts, yogurt, eggs, beans, vegetables and whole grains can all be useful parts of balanced meals and snacks.
It can also help to avoid going long periods without eating if that leaves you extremely hungry and more likely to overeat. Regular, balanced meals can make it easier to maintain consistent energy throughout the day, although there is no universal need for everyone to eat every two or three hours.
If you do experience a sudden slump, reaching for another sugary food may provide a quick burst of energy but can potentially continue the cycle. A more balanced snack containing protein, fiber and carbohydrates may provide more lasting fuel.
Frequent or severe episodes deserve more attention, especially if they involve confusion, fainting, seizures, blurred vision or significant shakiness. People with diabetes or those taking glucose-lowering medication should be particularly careful, since true hypoglycemia can require prompt treatment. If these symptoms happen regularly, talking with a healthcare professional can help determine what’s actually causing them.
