I loose my appetite when it is hot until I cool down. When hiking in the Grand Canyon that may not happen until breakfast.

I eat a substantial breakfast like black beans & rice with pepperoni.

What I eat during the day is a cup of nuts and two protein shakes. Straight protein shakes taste like you may have confused your chalk bag with your food bag so they are half instant breakfast. The pint shake is instant breakfast, dried milk, and protein shake powder. No matter how hot I get I will always drink.

Dinner actually is optional, but my favorite before dinner cocktail is a fuzzy navel. A pint of half Tang and half orange Metamucil with 2 oz. of peach schnaps.
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"In theory, theory and practice are the same. In practice, they are not."
Yogi Berra