If your body fat is above 15% (men) or 22% (women), weight loss is the faster path to better W/kg. If you're already lean, FTP gains are the only safe lever. Most riders benefit from doing both simultaneously using the fuel-for-the-work-required approach.
SIDE BY SIDE
FEATURE
LOSE WEIGHT
GAIN FTP
Speed of improvement
Fast (weeks)
Slow (months)
Sustainability
Risk of muscle loss
Permanent adaptation
Performance risk
Can lose power if done wrong
No downside risk
Effort type
Nutrition discipline
Training discipline
Best when body fat >15%
Highest ROI
Also helps
Best when already lean
Dangerous (RED-S risk)
Only safe option
CHOOSE LOSE WEIGHT IF
✓Riders with body fat above 15%
✓Riders who haven't changed nutrition habits
✓Post-winter body composition reset
✓Riders using fuel-for-the-work-required framework
CHOOSE GAIN FTP IF
✓Lean riders (under 12% body fat)
✓Riders with strong nutrition already
✓Early-season base building
✓Riders adding structured training for the first time