Carnivore and ADHD

Anyone in here who does the carnivore diet? Have you novices any change in how the medication works since starting the diet?

I take Vyvanse in the morning on an empty stomach and usually don't eat until dinner time. I've noticed I get very tired/low motivation mid afternoon - could this perhaps be the medication no longer working? Maybe my body has become better at metabolising it since transitioning ti carnivore? Before this it would last me till at least dinner/evening time.

Would love your input - also general inputs about how carnivore has affected your ADHD :)