DISCLAIMER: If you are grossed out by the mention of bodily functions, er, you may want to skip this post. I am not a doctor, and don't play one on TV. Reliable, solid information can be found at a library, or by asking a physician you trust.
I shall list what symptoms I can come up with, and/ or events, and then tell you what causes them. Hopefully that may help some of you untangle cause-and-effect of certain physical manifestations, like acne or loose bowels, etc.
You might think that I am a perfect mess, listing all these health troubles, but I feel that I am lucky that a) foods manifest their evils in me so quickly, and b) I get feedback (hah) and now really know what to avoid to make myself feel strong, fit, and healthy!!! I hope that more people will choose to start to listen to their bodies telling them what they do and do not need for healthy living.
As an anecdotal example, I have a friend who claims to suffer from IBS, but really I think he needs to a) de-stress, and b) eat better; that is, No Grains, No Alcohol for a few months, and re-evaluate his health! So many people choose to use Western drugs and pills, when all they really need is to learn to avoid certain foods that make them ill. But, no, the pills are easier!!! (SIGH!)
ACNE: Usually caused by too many fried foods, grains, milk chocolate, any soda (fizzy water, like Crystal Geyser, is OK). I get huge, cystic zits that take days to clear out, even with spot use of benzoyl peroxide, salycilic acid, and a sulfur topical application.
BLOAT (with or without gas): Usually caused by drinking beer or eating most types of fermented food. My mom thinks, and I am with her on this, that since beer is fermented and fizzy (and acts like bread rising), that when you drink it, you also become bloated and "rise". Sounds hippie-dippie, but it made more sense to me the first time I noticed it.
EXCESSIVE URINE: Caused when I drink too much caffeine (usually in coffee form). I become thirsty after drinking coffee, and consume extra water to make up for the diuretic effect of caffeine.... but still, I am peeing every 20 minutes for a couple of hours after consuming a cup of coffee. ("A cup of coffee" to me, means a single shot of espresso or approx 8 oz of drip coffee + usually enough cream to fill a 12 oz cup).
JOINT PAIN: Usually caused by eating grains, but may be exacerbated by nightshades (e.g. potatoes, eggplants, tomatoes, bell peppers, etc.), which are a known inflammatory for some people.
PSORIASIS FLARE-UPS (including DANDRUFF): Usually caused by eating grains. I haven't pinpointed what, exactly, is causing some of the flare-ups. I did notice that my psoriasis greatly healed in the month I was at my parents' house, and I also know that I ate really, really cleanly while I was over there, so I am sure it has some tie-in.
STOMACHACHE, leading to GAS, LOOSE STOOLS: Caused by eating grains and/or gluten, processed foods, too many fried foods, too much alcohol, food that wasn't at the peak of freshness (whether it's too old or too young, like unripe fruit). Pretty much when I eat anything that isn't good for me, I get a reliable reminder within an hour or two of my digression- my stomach feels like it's twisting and burbling, and I can get anything from a lot of gas to a few trips to the bathroom to let it all out. Thankfully, upsets from food never result in vomiting!!