Like several other food items on this list, pretzels can make you sleepy. Like white rice and corn chips, pretzels have a high glycemic index. After consuming these salty treats, your blood sugar and insulin levels spike, which actually shortens the time it takes you to doze off at night. That is because the increases in insulin and blood sugar levels help tryptophan enter the brain. Typically, you should want your levels to rise steadily to avoid insulin resistance and mood swings.

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