I was running low on the old bag of cumin seeds, so I bought some packaged ground cumin (no seeds to be found). While ground cumin may not last as well as whole seeds, I discovered that the packaged ground cumin was significantly more potent than freshly-ground 10 year old cumin seeds.
One and a half tsp of the new stuff blocked PEM for six days, as opposed to I think it was 4 days from 3 tsp of the old stuff. More experiments to be done with smaller amounts of the fresh stuff...
I think cumin is having less reduction of the general symptoms as it did from that initial dose (okay that was a larger amount, so that may be the reason), but it's still blocking PEM. When this last dose wore off, the PEM was _really horrible_, so I've extremely grateful that it's still working as a PEM blocker.
Cumin was effective cooked in curry, so it should be fine in tomato sauce too. I don't actually like cumin/flax pancakes myself, but I thought it was reasonably healthy as a food. My cooking options are quite limited due to reactions to quite a few foods, so pancakes (with no sugar or toppings) are a frequent part of my diet. *sigh*
Having the cumin the day before a PEM-inducing activity works for me. No need for follow-up doses until it stops blocking PEM (for example: six days for 1.5 tsp). I'm not actually sure how effective it is at blocking travel-induced PEM. I felt lousy the day after my last trip to town, despite cumin, but maybe those weren't true PEM symptoms. I plan to take more careful observations the next few driving trips.
Scientific constants? If you mean minimizing variables in an experiment, just minimize variables. If you want to test whether cumin blocks driving-induced PEM, go for a drive, but don't also go shopping, visit a friend, eat in a restaurant, etc. Don't fail to do an otherwise daily activity either. I'm trying to keep my general PEM-induction-testing activity to going for a 45-minute walk that includes a standard set of (somewhat painfully muscle straining) arm exercises. The walk doesn't induce PEM, but the arm exercises definitely do, unless the cumin is still working. I probably should go for an otherwise pointless drive (not for errands in town), just to test whether it's the driving that induces PEM.
I eagerly await the results of your testing. I sincerely hope that it does work for you. I consider cumin to be practically magical in its effectiveness at blocking my PEM.