There are 171 calories in 1 cup of Pretzels. Calorie breakdown: 6% fat, 83% carbs, 11% protein.
However, given that most wheat flour is enriched with extra nutrients, pretzels contain some B vitamins, such as thiamine, riboflavin, and niacin. These vitamins help your body convert food into sugars that can be used for energy ( 5 ).
The Glycemic Index (GI) measures how rapidly different foods can increase blood sugar. Glucose, the sugar your body uses for energy, has a GI of 100. It has the most rapid effect on your blood sugar. Pretzels have a GI of 80, which means they are a high GI food and can increase your blood sugar very quickly ( 9 ).