That's nice that you're in this together! Since I've started eating healthier my boyfriend has jumped on the bandwagon with me :)
People have suggested
https://www.amazon.com/dp/B00CKUEVT4/ref=cm_sw_r_cp_apa_i_8XbeBbK6EYVHB
and
and to watch this video for more information on starvation mode:
https://www.youtube.com/watch?v=1a8zuTfZhK0&list=PLp4G6oBUcv8w7mOuaiouhArVD2J4JMW5Z&index=10