It really is just a curiosity question. I’m interested in how the body would react if its energy source was only fats.[/quote]
Obviously, gene expression for the various enzymes and proteins involved in fat metabolism would be upregulated, more as glycogen levels become depleted and the body shifts to primarily fat oxidation in order to conserve its diminishing glycogen supply.
Gluconeogenesis of amino acids would be present for the first 1 - 3 days, then slow down as the body attempts to conserve its supply for protein recycling. Lipolysis providing NEFA and glycerol will be increased, the glycerol further reducing the need for amino acid oxidation. Your muscles and various tissues will switch over to fat oxidation as the primary metabolic means of energy production in order to further spare glucose. Ketone bodies will become prevalent in circulation as time goes on. Protein catabolism might increase after some time, dependent upon your degree of muscle mass and activity, in order to provide amino acids for the synthesis of vital proteins.
Your shits would be gross at the start. They’d probably be greasy and gross for the entire duration.
An abrupt shift from high carbs to no carbs can likely manifest as brain fog and an inability to concentrate. Energy levels might suffer short-term.
You’d feel lousy overall, nauseous from sipping oils and I can’t imagine you’d want to stick with it for very long.
MODOK would be able to give a better biochem review than this… or, you can dip into a textbook and see for yourself.