Fasted exercise has some benefits, but not top peak performance

Training in a fasted state is something that has been fairly popular. Many enjoy it because they don't like the feeling of being too full during physical activity. Others are a bit more intentional with fasted exercise though and are looking for specific benefits. Typically these benefits are related to body composition or weight goals but it needs to be done in a smart manner. Specifically, not when in a situation where needing to perform at one's peak potential.

What is fasted exercise and why do it?

Fasted exercise is when training in a fasted state, meaning not eating anything before it. Most people do this by working out first thing in the morning. Other common times are done several hours after their previous meal or by having a cardio session after an intense workout just occurred. The main goal is to be working out when the body has low glycogen and overall energy stores. What happens then is the body is forced to pull from fat stores to produce the needed energy.

Increased fat burn and body composition

By forcing the body to use fat for energy, the body is being trained to use fat more easily. In theory this should help the body to burn fat throughout the day more as well. So not only during the workout is the body using more fat, but it could potentially last even after leaving the gym as well. People seeking improvements in body composition are very interested in this strategy because of that effect right there. What's important to keep in mind though is training with a low/empty fuel tank can make it a lot harder to train at a level you normally would.

Performance impact

Having that low fuel tank is what could negatively impact your performance in that moment. If trying to make that fat burn change in the body, don't try that strategy when doing an intense and competitive session. You also want to be careful not to try fasted exercise if simply looking to lose weight. It's likely you will fatigue a bit earlier in this situation which could decrease the overall work done in that session. Save this for light sessions. Peak performance requires peak energy on hand!

When to try fasted exercise

Low intensity, cardio focused sessions typically is best. Having a set amount of work that's to be completed helps too. That makes sure you still get the total amount of work in while getting the fat burn benefits. As always, you need to make sure you're still staying hydrated. Most importantly please do not do this on intense training days, especially not on competition days! Your performance will almost always be better with a little food. If worried about feeling full, keep the snack before hand light. Stick to foods you know and that sit well for you. Liquids are easiest to digest and would be a great option to consider as well.

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