Next time you guys are on a dinner date, pay special attention to what kind of sandwich she orders, as it might reveal a hidden insight into her personality, new research has claimed.

Food psychologist Dr Elizabeth Jones, of Mindlab, who conducted the correlation analysis study for Warburtons, said: “Personality traits tend to go hand-in-hand with personal habits and routines, which allows us to match the type of bread and filling a woman chooses to have at lunch with a personality group.”

Here are the eight key sandwich personalities:

The Tuna and Sweetcorn on White Bread: “High Flyers”

The Prawn on Brown Bread: “Sensitive Souls”

The Ham Salad on White Bread: “Forward Thinkers”

The Chicken Salad Wrap: “Extroverts”

The Egg Mayo on Wholemeal Bread: “Home Bodies”

The BLT on Seeded Bread: “Opportunists”

The Cheese and Pickle as it comes: “Brainiacs”

The Beef Roll: “Impulsives”

The common sandwich has been part of our diet and heritage for centuries, so it’s little wonder that the choice of a sarnie can reveal what type of person a woman is.

And here’s a sandwich related joke:

There were three men working on the top of a cliff. The first man said, “If I have cheese in my sandwich tomorrow, I’ll jump off this cliff.” The second said, “If I have jam in my sandwich tomorrow, I’ll jump off the cliff.” The third said, “If I have ham tomorrow, I’ll jump off the cliff.”

The next day, the first man had cheese, the second had jam, and the third had ham. So they all jumped. At the funerals, the wives of the first two men said, “Why didn’t they just tell us they didn’t like their sandwiches?”

The wife of the third said, “I don’t know why my husband jumped off the cliff. He made his own sandwiches.”

They’re some of the age old debates: “which came first, the chicken or the egg?”, “are we alone in the universe?”, “is time travel humanly possible?”…”what exactly is a hot dog!!??”. Well, thankfully the state of California has been working on it, and managed to answer one of these quizzical questions.

According to new legislation, a hot dog is defined as “a whole, cured, cooked sausage that is skinless or stuffed in a casing, may be served on a bun or roll”. The definition has been introduced in order to distinguish between pre-cooked hot dogs and uncooked meat sausages. So the next time you’re wolfing down a weiner (which on average, is consumed in 6.1 bites) you’ll know exactly what you’re eating.