There is no way to know for certain whether someone else has candida overgrowth. There are a few “telltale” symptoms that you may have it, which include constipation/IBS, white tongue, food allergies, etc. If you ever have taken antibiotics in your lifetime, this can cause a flora imbalance within the gut.
The only way to know for certain is to try out the diet on the forum and if you experience “die off” symptoms and feel worse, than this is likely due to candida. Try out the diet/protocol for 1-7 days and it should cause die off. If you feel symptom free after trying the diet, than you likely don’t have an overgrowth.