You can target fat loss in one body area
The principle that exercising a specific body part causes preferential fat loss from that area (spot reduction) is not supported by the scientific evidence. Fat loss occurs throughout the body based on genetics, hormones, and overall caloric deficit.
What we know
Spot reduction is the belief that performing exercises targeting a specific muscle group - such as abdominal crunches for belly fat - will preferentially reduce fat in that area. This concept has been examined in numerous clinical trials and has not been confirmed as a reliable or practical method of fat loss.
A 2021 meta-analysis of 13 studies involving over 1,100 participants found that localized muscle training had no significant effect on localized fat deposits. A 12-week randomized clinical trial found no greater reduction in abdominal fat between participants performing abdominal resistance exercises combined with dietary changes versus dietary changes alone. When fat is mobilized for energy, it is drawn from throughout the body via hormonal and metabolic processes that are not region-specific.
The University of Sydney summarized the state of evidence in 2023: fat distribution is largely determined by genetics and sex hormones, and while targeted exercise increases local muscle mass and blood flow, it does not cause the overlying fat to disappear preferentially. The body uses stored fat from wherever metabolic conditions favor it, not specifically from adjacent tissue.
A small body of research has suggested that under very specific conditions (high-intensity exercise of a region followed by sustained cardiovascular effort) localized fat oxidation may be modestly elevated near active muscles. However, this effect is not practically significant for body composition goals. Effective fat reduction requires an overall caloric deficit achieved through diet and general exercise.
Common claims
- Doing crunches will specifically burn belly fatNot supported by evidence
- Targeted exercises reshape specific body areas by burning local fatLocal muscle grows; fat loss is systemic
- Spot reduction is a valid strategy promoted by fitness professionalsMajor fitness bodies advise against it
- A 2021 meta-analysis proved spot reduction worksMeta-analysis found no significant effect