Chocolate isn't a good hypo treatment, if blood glucose is very low It may not be quick enough.
Maybe your friend was just a bit low rather than really hypo.
If I wasn't that low (say just under 4mmol/l ) and had gone low because I'd been doing some housework/ lot of walking round the shops etc then a choc biscuit with a cup of coffee could be just the thing. (you learn this sort of thing by experience.) Personally though I would normally only eat one choc biscuit (have been known to share a piece of cake with my OH) Most biscuits have at least 8gm of carbohydrate so 8 biscuits would (without insulin) would send me from mildly hypo to sky high.
Normal advice for a hypo is to take 10- 20 g fast acting glucose. wait 10-15 min and test again. If glucose level still under 4mmol/l retreat.
10g rapidly absorbed carbohydrate
• 100mls Ribena (from carton)
• 3 glucose tablets or lucozade tablets
• 50mls Lucozade Energy
• 100ml cola or 7-up or Sprite (not diet varieties)
• 3 jelly beans or jelly babies or fruit pastilles
• 100ml unsweetened fruit juice (from carton)
• 2 teaspoons of honey or jam
When level is back to normal consider if it is more than an hour to the next meal, if it is eat something with a slower carb
Portion of fruit
1 – 2 slices Toast
1 Sandwich
2 biscuits
1 cereal bar or breakfast cereal bar
Again it's personal but I would normally take 10g or under of fast carb and won't normally eat the 'extra' ; it really depends upon what I'm doing and the reason for the hypo
There are lots of info sheets online. Here's one for adults
http://www.sheffield.nhs.uk/dietitians/ ... caemia.pdf