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It´s completely unrelated. It was implied WITH TORIKO that if he doesn´t eats constantly, he goes into autophagia.
So the best guess so far would be that those with gourmet cells need to eat more often/in more quantity to calm down their cells, regardless if they are bishokuya or not.
Yes, you're correct, they use 100,000,000 calories even at rest due to their very efficient bodies, more powerful g-cell users probably use even more, setsuno was implied to have immesurable calories, since she lost over 10 million kilocalories to kousairou's attack, and didn't even seem to notice, this probably explains how ichiryuu degraded when he didn't eat constantly, and midora preserved himself over that time.
However, since saisaya preserve ingredients, they do not go out and actively hunt ingredients, therefore they don't go after the most nutritious and power-giving ingredients either, just the ones that need help, and so far we have never seen any saisaya revive an ingredient to eat it themselves, i.e. teppei did not eat the dodourian bomb nor the hellboros, and he vehemently protected the gourmet show window, his interest is not eating at all costs, but preserving it instead, therefore he got where he is while eating considerably less than if he were seeking power-giving ingredients just to eat them entirely, and focused all his energy on that.
Guys don´t use mangapanda...
The saiseiya preserve food indeed, but that never implied they eat more or less than anyone else. They do refrain at all costs to hunt/eat endangered ingredients, however.
Here´s an example:
On the very second he got on Setsuno´s limousine jellyfish he started eating like a pig just like everyone else, and he didn´t looked exhausted nor starved to me.