Let's try and nail this issue of stomach/duodenum contents and time of death.
Many people seem to have seized upon the (true) fact that estimating time of death accurately with reference to stomach/intestinal contents can be very difficult, with large margins of error. But this imprecision is only the case when a) there is an absence of other indicators of ToD, and b) there is some continuum in the transit of food through the entire digestive system observed at autopsy.
In the case of Meredith Kercher's death, however, I believe that it's relatively easy to say with confidence that her death must have occurred
before 10pm at the very latest, and most likely before 9.30pm. This is because
none of her stomach contents had yet passed through to her duodenum.
I don't believe anybody will be able to find a credible witness or online source (academic paper, credible medical site etc) which would state that 100% of ingested food from a moderate sized meal will still be present in the stomach more than 3 hours after ingestion - at a very maximum. We know that Meredith's pizza meal was consumed between 6.00pm and 6.30pm (or 7.00pm at the very latest). So for 100% of that meal to still be within her stomach at the time of death, her death HAS to have occurred between around 8.00pm and 9.30pm (or 8.00pm and 10.00pm at the very outside). And since we know she was still alive at just before 9.00pm, then in this case her time of death can be narrowed down from 9.00pm to 10.00pm maximum.
It's astonishing to me that the defence seemingly let this issue get past everyone at the first trial. In order to support the prosecution's time of death (which was accepted by the court) of 11.30pm-11.50pm, the pizza meal would have had to remain totally within Meredith's stomach for at least 4.5 hours - and probably in fact more than 5 hours. This is so far outside of known parameters of gastric emptying that it's simply laughable.
I very deeply believe that this one point, if argued strongly and correctly by the defence attorneys in the appeal, will by itself render the first court's verdicts unsafe. There is, I believe, no documented case in medical history of a meal such as Meredith's pizza meal remaining 100% in the stomach for more than 3 hours. In fact, normally a meal such as this will start to pass through to the duodenum within 90 minutes of ingestion, but 3 hours is the outer boundary. There's no way that 4.5 or 5 hours is medically feasible - especially given that Meredith was a fit, healthy young girl, who was in a relaxed state for at least a couple of hours after eating, and who drank no alcohol with her meal.
Just for further reading, here are some more links:
http://www.vivo.colostate.edu/hbooks/pathphys/digestion/basics/transit.html
(Note the red line on the graph in the above link, showing stomach emptying % Vs time in minutes)
http://www.ijp-online.com/article.a...e=4;spage=238;epage=240;aulast=Awasthi;type=0
(The average time for 50% emptying of stomach contents in healthy adult males is given as 82 minutes)
http://onlinelibrary.wiley.com/doi/10.1111/j.1440-1746.2006.04449.x/abstract
(Median time of 50% emptying of stomach contents from a solid meal is given as 127 minutes, with the 75th percentile mark at 168 minutes. This study also gives T(lag) times, which is the time elapsing before the first food leaves the stomach to the duodenum. For solid meals, median T(lag) is 81.5 minutes, with the 75th percentile at 102 minutes).
If there was no food matter in her duodenum, Meredith Kercher was definitely killed before 10.00pm, and almost certainly before 9.30pm.