1.Because/Since we read the book, we have learned a lot.
  2.If we read the book, we would learn a lot.
  3.We read the book; as a result / therefore / thus / hence / consequently / for this reason / because of this, we've learned a lot.
  4.As a result of /Because of/Due to/Owing to reading the book, we've learned a lot.
  5.The cause of/reason for/overweight is eating too much.
  6.Overweight is caused by/dueto/because of eating too much.
  7.The effect/consequence/result of eating too much is overweight.
  8.Eating too much causes/results in/leads to overweight.