Research
Energy balance
Vigorous exercise is more effective than moderate exercise for reducing subcutaneous fat and improving body composition, even when total energy expenditure is lower.
Don't worry about staying in a 'fat burning' low-intensity zone. Vigorous exercise can lead to greater fat loss even if you burn fewer total calories than a long, slow walk, likely due to metabolic after-effects.
ModerateSupportsMEDIUM confidence
Also in a training study using two levels of exercise intensity, there was a greater subcutaneous fat loss for the high-intensity group despite the lower total energy cost of the programme (22).
Why this rating
Based on specific training studies cited (22, 23, 24), but noted as part of a broader discussion on intensity.
Source
How much physical activity is enough to prevent unhealthy weight gain? Outcome of the IASO 1st Stock Conference and consensus statement
Wim H. M. Saris et al. · Obesity Reviews · 2003
DOI 10.1046/j.1467-789x.2003.00101.x
narrative_reviewCited 860×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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- The standard public health guideline of 30 minutes of moderate-intensity physical activity daily is insufficient for preventing unhealthy weight gain or weight regain in many individuals.Good
- Prevention of weight regain in formerly obese individuals requires 60-90 minutes of moderate-intensity activity or lesser amounts of vigorous-intensity activity.Good
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