Talk about bad science here

· I once saw a bloke at the opening of a Jackson Pollock exhibition in the Tate, wearing a T-shirt that said: "my cat could do better". What, you may be wondering, has that got to do with Dr Gillian McKeith (PhD)? Well now. Besides her PhD, which we have already discussed, there were a few other interesting entries on her CV. For example, she is proud to announce under "Professional Associations" that she is a certified member of the American Association of Nutritional Consultants (AANC), which certainly sounds impressive. I bet you get a little certificate and everything.

· In fact, I know you get a certificate, because I'm holding it in my hand right now. It's in the name of my cat, Henrietta. I got it in return for $60, and it's a particular honour since dear, sweet, little Hettie died about a year ago. So, coming in a bit cheaper than Gillian's non-accredited correspondence course PhD and Masters degrees (although she will have got a discount from "Clayton College of Natural Health" if she ordered them both at once), it looks as if all you need to be a certified member of the AANC is a name, an address, and a spare $60. You don't need to be human. You don't even need to be alive. No exam. No check-up on your qualifications. And no assessment of your practice. I guess that could be embarrassing for some of their certified professional members. Presumably, the diploma is there to certify that you have $60.

· If you know anyone else who is showing off about being a Professional Certified Member of the AANC, I'd like to hear about it. The only one I can find so far is a man called Dr Bannock who presented Why Weight on Channel 4 and Fat Academy on Discovery. No, I'd never heard of him either. He says he is a "Member of the American Association of Nutrition Consultants (Board Certified Nutrition Consultant)". Glad you added that bit at the end, Dr Bannock. His website mentions his PhD in Nutritional Physiology, but he doesn't say where it's from; his website also features the odd photograph of a stethoscope, although to my disappointment, unlike Hettie, he's not gone as far as dressing up in it endearingly.

· But back to the money: if anybody wants nutritional advice from the decomposing corpse of my ex-cat, I shall be setting up a small shrine at the bottom of the garden, where you can leave chewed mice, ready cash, and offers of a primetime TV series on Channel 4.

· Please send your bad science to bad.science@theguardian.com