B777-222 CAPT RPTS FO SUFFERS PROBABLE FOOD POISONING ON TRANSATLANTIC FLT.

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APPROX 30 MINS AFTER TKOF; BREAKFAST CAME UP TO THE COCKPIT. FO ATE PANCAKES; SAUSAGE AND FRUIT PRESERVE. I ATE NOTHING. ABOUT 2 1/2 HRS INTO THE FLT; FO STARTED FEELING UNCOMFORTABLE AND HAD STOMACH PAINS. I TOLD HIM THAT IF HE DIDN'T FEEL BETTER HE COULD HAVE BOTH BREAKS. 5 MINS LATER HE LOOKED VERY PALE AND HE SAID HE WAS WORSE AND HAVE TO LEAVE THE COCKPIT. I IMMEDIATELY CALLED FOR THE FIRST CLASS FLT ATTENDANT OR PURSER BUT NO ONE ANSWERED. I CALLED 4 TIMES! FINALLY; I CALLED DOOR 2L WITH AN IMMEDIATE ANSWER. I SAID I NEEDED A FLT ATTENDANT TO THE COCKPIT IMMEDIATELY. THE PURSER CAME RIGHT UP; THE FO LEFT AND SPENT THE FOLLOWING 1 1/2 HRS IN THE FORWARD LAVATORY. I CALLED DOOR 2L AGAIN AND ASKED THE FLT ATTENDANT TO WAKE THE PNF FO IN THE BUNK AND HAVE HER COME UP EARLY. SHE RETURNED TO COCKPIT WITHIN 5-10 MINS. THE FLYING FO SPENT MOST OF THE REST OF THE FLT EITHER IN THE LAVATORY OR RESTING IN THE BUNK. THE FLT ATTENDANTS TOOK GOOD CARE OF THE FO; GAVE HIM EXTRA WATER AND GINGER ALE. TOWARD THE END OF THE FLT; HE RE-DRESSED AND CAME BACK TO THE COCKPIT FOR LNDG IN THE JUMPSEAT. HE HAD REGAINED HIS COLOR AND SAID HE WAS STARTING TO FEEL BETTER. HE RESTED ON THE LAYOVER IN ORD AND FELT 100% THE FOLLOWING DAY SO CONTINUED ON THE TRIP. IT WAS A TEXTBOOK CASE OF FOOD POISONING. HOWEVER; I DID CONSIDER OTHER OPTIONS SUCH AS LNDG IN GANDER IF IT HAD BEEN A MEDICAL EMER. FORTUNATELY; I HAD SLEPT WELL IN LHR AND GOT UP OFTEN TO STRETCH IN THE COCKPIT. 2 LESSONS LEARNED: 1) IMPORTANT TO EAT AT DIFFERENT TIMES; OR AT LEAST DIFFERENT MEALS; AND 2) THE NECESSITY TO INFORM INFLT THAT WHEN THE COCKPIT CALLS; IT MAY NOT BE JUST TO ASK FOR A COFFEE.