After years of dieting does your metabolism slow down?

yasmingingerbread

I have been dieting on and off for two years. I lost a total of 20 pounds and have taken breaks periodically. I am planning on losing another 5 pounds but I'm worried that after two years my metabolism will be tired from all of this and losing weight will be much harder.
Thanks in advance!

jemhh

Adaptive thermogenesis is a real think. However, losing 20 pounds over two years wouldn't make me worry about it.