Common sense says a chicken Caesar salad makes a lower-fat lunch than pasta with sausage, a barbecue chicken pizza or lasagna. Right?

For consumers staring up at a fast-food menu board, coming up with the right answers to questions like that is essential if they're going to choose more healthful meals and avoid obesity, diabetes and a raft of other chronic illnesses.

But most Californians don't have a clue, according to a Field Poll released Wednesday. It was commissioned by public health advocates backing a bill in the state Legislature that would require chain restaurants to post nutritional information on menu boards and menus.

The poll asked 523 registered voters to answer four seemingly simple questions: Pick out the dishes with the most calories, the fewest calories, the least salt and the most fat from among menu items from Denny's, Chili's, Romano's Macaroni Grill and McDonald's. Just as on the menus, the only information given was the name of the dish.

By any measure, the respondents flunked. Two-thirds answered all four questions wrong. And no one not one person got all four right. The results were the same regardless of age, income, education or political party, according to the poll.

The same poll showed that 85 percent of Californians support the idea of requiring chain restaurants to print calories and other nutritional information on their menu boards and menus; 15 percent are opposed. The margin of error was plus or minus 4.5 percentage points.

The poll is part of a campaign by the California Center for Public Health Advocacy to attract support for SB120, which calls for menu labeling as a way of helping consumers fight obesity and its related health problems. The bill, sponsored by Democratic Sens. Carole Migden of San Francisco and Alex Padilla of Pacoima, is expected to be up for a state Senate vote soon, perhaps next week.

Patterned after a pioneering law that goes into effect in New York City on July 1, the bill would require chain restaurants with 10 or more outlets to post calories on their menu boards. Restaurants with menus would have to print calories, fat, saturated fat and salt content for each dish.

California is one of 11 states following New York City's lead and considering such labeling.

The California Restaurant Association opposes the bill, which it estimates would affect about 40,000 of the state's 87,000 restaurants.