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Carbs are very easy to convert into glucose. A crab-rich meal can easily cause a spike in glucose levels. Glucose gets converted and stored as fat.

Fats and proteins take longer to convert into glucose, and are less likely to cause a glucose spike and subsequent fat storage process.

Carbs are not unhealthy, especially if you can spend the energy immediately. However, it is very easy to consume a large amount of carbs in one go, thus a greater risk for an average person.