The point with bonds is that they'll "recover their losses" if you hold them to maturity.
Think about three time frames:
Year 0: I buy a new-issue $100 bond paying 1.5% interest for $100. I will receive $1.50 every year for 5 years and then get $100 back.
Year 3: Interest rates have increased pretty dramatically, so 2-year bonds are now paying 3% interest. So for someone 'shopping' for a bond that matures in 2 more years, they can buy a new-issue one paying 3% or they could buy my 5-year with 2-years remaining that is only paying 1.5%. Obviously they would buy the new-issue unless I offer a substantial price discount. So if I "mark to market" my bond, I would have to sell it for something like $85 to be equivalent to the new-issue debt. My bond is still paying 1.5% and will still pay $100 when it matures, but it's much less valuable since the interest stream is smaller. I don't sell my bond because I don't want to take the loss.
Year 5: My bond matures and I receive $100 along with the final interest payment.
We're talking about step 2 above -- the losses are only realized if you sell the instrument, so you don't need to "recover" any losses, the underlying debt is still as likely to pay out as they were before, it's just a debt maturity question.