[misc] how long does it take for your skin to react badly to a food?

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So I've been looking into recently, and am very interested in the correlation between diet and skin. I see a lot of information that states that poor diet choices can cause acne to flare up and skin to become inflamed etc, this makes sense to me.Does anyone know how long actually it takes for your skin to mess up from food? Say someone ate dairy how long would it take for their skin to causw inflammation and cause spots, or someone ate something really greasy how long would it take for this to have an effect on the skin..Does anyone have any answers to this or do we still not have the research for this?I for one think that one of the biggest causes of acne personally is from nutrition
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Submitted by drizzyxs