Diet Pepsi is tweaking its formula to stay sweet a little longer. PepsiCo Inc. is testing new artificial sweeteners that let the soda keep its taste for a longer period of time. The problem is ...

NEW YORK – Diet Pepsi is tweaking its formula to stay sweet a little longer. PepsiCo Inc. is testing new artificial sweeteners that let the soda keep its taste for a longer period of time.

At least in the short term, Diet Pepsi sales are likely to see bump from the marketing push around the new formula, which will include in-store sampling and discounting in coming weeks.

NEW YORK — Diet Pepsi is tweaking its formula to stay sweet a little longer. PepsiCo Inc. is testing new artificial sweeteners that let the soda keep its taste for a longer period of time.

When I did the Elemental Diet for the first time, I would daydream about a good-tasting formula almost as a fantasy. Then one day I decided to assemble a team of scientists and doctors to game it ...