Tyrosine to curb hunger during fasting
DeLauer emphasizes tyrosine's conditional efficacy. He references a Psychiatric Research study showing that tyrosine is inert at normal dopamine levels but becomes potent when depleted — precisely the state fasting induces. He describes 'food noise' as the constant background chatter about food that drains mental energy. By restoring dopamine, tyrosine silences that noise, helping people stick to their fast. It is also effective on regular diet days when cravings spike due to caloric deficit.
Tyrosine is the amino acid precursor for dopamine synthesis. Fasting and willpower exertion deplete dopamine stores. When dopamine is low, tyrosine hydroxylase can be more active, and supplementing tyrosine provides needed substrate to restore dopamine, reducing the brain's search for alternative rewards like food.
I'd highly recommend just trying maybe 2 grams or so on days where you're feeling like I really want to give in.

