Actually eating like a caveman did not mean eating only meat/fish/foul. It also included eating all kinds of vegetable matter, nuts, roots, and fruits.
Many modern ills are caused be eating a high carb diet that encourages the growth of candida albicans or thrush. This yeast infection can cause many kinds of symptoms. In fact if you have a health problem, especially one that is vague or hard to diagnose, try the "caveman diet". Basically, when you select food to eat, ask yourself, was someone, somewhere able to eat this 10,000 years ago. If the answer is yes then it is part of a "caveperson diet".
If you are infected with yeast, and try this diet, your yeast will "demand" that you eat sweets and carbohydrate, saying "feed me, feed me". You have to be strong for a few days and say "no $^(_*&& yeast is going to dictate my life." As the yeast starts to die of starvation it will poison your body and you may feel ill for a few days. The more yeast in your system, the worse you may feel. Be patient, give the "Caveman/Atkins Diet" a week, and you should start to feel a lot better and your symptoms improve.
I was once called to the home of a fellow in the last stages of AIDS, suffering from severe yeast infection. I looked in his refrigerator to find something to cook for him. Of 23 foods, only one was not a yeast treat. The only not yeast feeder he had was chicken.
If you want to try the Atkins Diet, easy to find on Google, be sure you start with the rigorous "Induction Phase". Your body will burn Fats, Carbohydrates/Sugars, or Protein for energy. By eliminating almost all Carb/Sugar, and eating adequate protein, and some fat, the body will burn the surplus fat in your body first. You can eat lots of green salad, celery, cucumbers, etc. Some cheese, sour cream, ricotta. 1 or 2 eggs, 2 slices of bacon, and modest quantities of related foods. This diet really works, and you don't feel all that hungry on it. Also take good vitamin/mineral supplements while dieting.
Asians do eat a lot of rice, but also a lot of low carb vegetables, and seaweed, which is high in trace minerals. The caveman was not killed by his diet, but by severe living conditions like winter, drought, etc.
And who said the caveman's diet was all meat and fish? Loren Cordain's book, based on anthropological data is the best on the subject. The yeast stuff is hooey, IMO.