Fasted Cardio: Fat Used During Exercise Is Not the Same as Fat Lost

Oct 3, 2023

2 min read

Updated: 23 hours ago

Exercising before eating can change the fuel used during a session. That does not automatically show a greater reduction in body fat over weeks or months.

Keep the outcomes separate

An acute metabolism study answers a different question from a long-term body-composition trial. Schoenfeld and colleagues' small four-week study found similar changes between fasted and fed aerobic training under its conditions. It does not prove identical results for every person, but it challenges a universal advantage claim.

Choose for practicality

Some people prefer an easy session before breakfast. Others feel and perform better after food. Consider the task, appetite, symptoms and the rest of the day rather than assuming discomfort is evidence of better fat loss.

Do not turn it into a restriction contest

Longer fasting or a harder workout is not automatically a better combination. If you feel unwell, stop and review the approach. People with relevant medical conditions or medication needs should get individual advice.

Judge the plan over time

Look at the complete food and activity pattern and whether training remains manageable. A session does not need to maximise fat oxidation to contribute to a useful programme.

Choose a schedule you can maintain and fuel appropriately. The label fasted cardio is less important than the routine it creates.