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@Greenbank
Want to buy a bridge?
I'd put Scientology as having a considerably stronger grounding in science than Blood Type/Group Diets. Just eat a healthier diet.
(The Blood Group Diet seems to work because each suggestion is a relatively healthy diet in its own right. You'll see similar results if you follow the suggested diets for any of the blood groups, regardless of your own group. It's been routinely panned by experts. Hopefully Ben Goldacre has it queued up.)
The usual cause of cramping is salt/electrolyte depletion. Very common on long rides as you sweat out the salts and don't replaceme them adequately (i.e. only drinking water to replace the fluid loss). Electrolyte tables like Zym and Nuun are the modern fix, I usually use Nuun tablets in every other bidon of water (every bottle on hot rides). The old school fix is a banana which is high in potassium.