Slim pickingsI've never been one for diets, although I did once survive for over a fortnight on the small bowls of Bombay mix they kindly used to place on the bar at a long-since defunct hostelry on Fenchurch Street. Still, I hardly think my informal research into what happens if you just eat crisps - and the terrifying after effects of a lentil-only diet - make me the best qualified person to comment on news that Parthenon Capital, the firm mooting a Nymex takeover, has already bought a stake in Atkins Nutritionals, owners of the Atkins diet. One thing occurs to me, though:...