The best replacement for fiber is copper.

The best alternatives to fiber are rated as following:
★★★★★  copper
★★★★  fibre
★★★  cable
★★  fiberglass
★★  protein
★★  roughage
★★  insoluble fiber
★  carbs
★  t1
★  ethernet
★  soluble fiber
★  pomade
★  carbohydrates
★  coax
★  aluminum
★  cat6
★  cellulose
★  dietary fiber
★  wireless
★  forming cream
★  laxative
  stool softener
  cellulose is
  iscsi
  thread
  multimode fiber
  single mode fiber
  starch
  aluminum bike frames
  protein more filling
  fabric
  multimode
  cable internet
  psyllium fiber
  titanium
  kevlar
  aluminum bike
  copper speed
  dsl
  graphite
  insoluble
  rebar
  fiber
  bran
  gigabit
  microwave
  copper latency
  utp
  psyllium
  cat 5
  ace
  adsl

Your alternative for fiber is not listed? Suggest!
Speaking about fiber, one probably shouldn't forget about carbs.

Other search terms related to fiber and their ratings are:
★★★★★ carbs
★★★ probiotics
★★★ gluten
★★ pgx
★★ protein shake
★★ low carb diet
★ protein
★ no carbohydrates
★ grains
★ constipation
★ carbohydrates
★ no carbs
★ no gas
★ vitamins
★ laxative
★ inulin
★ gluten free diet
excess gas
juicing
weight control
food
You have in mind a companion for fiber and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of fiber in all years. Click on graph for more.
fiber
copper
fibre