*ahem* I don't want to be the one to piss on your chips but did you know that 90 percent of crisps (and soft drinks) contain artificial sweeteners? Do you know what artificial sweeteners can do to your body?:
Aspartame
Sodium Saccarin
Acesulfame K
'Contains a source of Phenylalanine'
etc.
I can vouch for some of the info here my son used to be very hyper-active (naughty some people called him) until I read up on Aspartame. Now that it's out of his diet he behaves perfectly (well..almost); if I took him to a doctor he would have said he was ADHD and needs Rytolin...