Due to business needs I have had to put up with changes many times; but I've never stinted on breakfast and do not now. My wife fitted in with me and then with school time demands so our life pre-retirement was never settled.
Now we both have a good breakfast and then go through to evening dinner without any snacking in between. As I am trialling a Fodmap diet that has meant the family also eats some of my foods - and why not as I have lost a stone and a half without feeling any different!
Whatever changes you make my recommendation is always to start the day right - have a good breakfast.
Forgetting where you left your keys does not mean you are “losing it”