Why are Sloths so slow, and what do they eat?? Are they really too slow to catch other living things??

Question: Why are Sloths so slow, and what do they eat?? Are they really too slow to catch other living things??
- Keywords:
  diet,
  eat,
  nutrition,
  sloth,
  speed
Asked by oona12 to Charlotte, Jo, Kevin, Louise, Valeria on 18 Jun 2012. This question was also asked by bensunderland.
- Joanna Cruden answered on 18 Jun 2012:
  
  Sloths eat buds, shoots and leaves, there is not much energy in the food they eat and they have a very low metabolism and therefore not much energy to move much

Question: Why are Sloths so slow, and what do they eat?? Are they really too slow to catch other living things??