Maybe you're lactose intolerant? Don't really know symptoms of that though.
Since you mention that it happens on and off and with no relation to specific foods, perhaps you have a sensitivity/allergy to some of the foods you are eating? If that's the case, then using a supplement won't help the problem; only eliminating that particular food would (or eating it in smaller doses).
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Prime did wonders in the appetite increasing area.
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weed. a few puffs after a meal and you'll be hungry again in minutes.
if you need help finding it pm me.