The best replacement for metabolism is catabolism.

The best alternatives to metabolism are rated as following:
★★★★★  catabolism
★★★  biotransformation
★★★  homeostasis
★★  digestion
★★  low metabolism
★★  slow metabolism
★★  anaerobic metabolism
★  heart rate
★  metabolic rate
★  tapeworm
★  fast metabolism
  slow
  thyroid
  hypoglycemia
  30 day shred
  aerobic
  aerobic metabolism
  respiration
  carbohydrate metabolism

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Speaking about metabolism, one probably shouldn't forget about gaining weight.

Other search terms related to metabolism and their ratings are:
★★★★★ gaining weight
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Google Trends

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metabolism
catabolism
biotransformation