Find out the facts! The Truth: You should always eat something before exercising so your body has enough fuel to power through your workout. The rationale behind this widely accepted myth is that forgoing food before exercise will force your body to burn more fat during your workout.ind out the facts! The Truth: You should always eat something before exercising so your body has enough fuel to power through your workout. The rationale behind this widely accepted myth is that forgoing food before exercise will force your body to burn more fat during your workout.