Rats are most attracted to calorie-dense foods that are high in fat, sugar, or protein. Peanut butter, chocolate, bacon, dried fruit, and whole grains consistently rank among the strongest attractants. But what draws rats in depends partly on the species, and understanding their food preferences can help you bait traps effectively or eliminate the food sources pulling them onto your property.
What Rats Prefer: Fat, Sugar, and Protein
When given free access to separate sources of carbohydrates, fat, and protein, rats get roughly 50% of their calories from fat, 28% from carbohydrates, and 22% from protein. They eat the largest meals when fat is the main component, consuming about twice the energy per sitting compared to carbohydrate or protein meals. This explains why greasy, rich foods are such reliable attractants.
Rats also have a strong preference for sugar, particularly sucrose (table sugar) over glucose. In preference tests, rats chose sucrose about two-thirds of the time. When given free access to sugary and fatty foods alongside normal food, they consistently cut back on their regular diet and overeat the calorie-rich options instead. In short, rats gravitate toward the same junk food humans do.
The Best Foods for Baiting Traps
Peanut butter is widely considered the most effective rat bait. Its strong aroma travels well, its sticky texture forces rats to engage with the trap rather than snatching the food and running, and its combination of fat and protein is exactly what rats seek out. Chocolate works for similar reasons: it’s aromatic, high in fat, and appeals to their preference for sweetness.
Other highly effective baits include:
- Bacon: The smoky smell is a powerful attractant, and its high protein and fat content makes it hard for rats to ignore.
- Dried fruit: Raisins, apricots, and dates are high in sugar, and their chewy texture makes them difficult to steal without triggering a snap trap.
- Whole grain cereals: Rats prefer wholemeal and whole wheat over refined white flour. In feeding studies, rats consistently chose wholemeal when given the option, and ate little to no white flour when whole grains were available.
Adding oil or fat to grain-based bait increases its appeal. Rats preferred wheat mixed with peanut oil over plain wheat in controlled experiments. However, not all oils work equally. Cod liver oil actually repelled rats at concentrations of 2 to 4%, so fish-flavored options are generally a poor choice.
Norway Rats vs. Roof Rats
The two species you’re most likely to encounter have somewhat different tastes. Norway rats (the larger, ground-dwelling species common in basements and sewers) are heavy protein and fat eaters. They’re strongly drawn to meat, with liver ranking as the single most preferred food in one long-running study. They thrive on cereals, grains, and cooked or processed meats.
Roof rats (the smaller, agile climbers that nest in attics and trees) lean more toward fruits, nuts, and seeds. In Florida, they’re considered the most damaging rodent pest to fruit crops. They hollow out citrus and melons by gnawing a small hole and eating from the inside, and take large bites out of softer fruits like peaches and tomatoes. If you’re dealing with roof rats, fruit-based baits or nut butters tend to be especially effective.
Household Items That Attract Rats
The biggest attractants around most homes aren’t things you’d think of as “rat food.” Bird feeders are one of the most common reasons rats show up in a yard. Rats love birdseed and will return repeatedly once they find a source. Seed blends with filler grains like millet, milo, or sorghum are especially problematic because birds scatter them on the ground, creating an easy buffet at rat level.
Pet food is another major draw. Dry dog and cat kibble left in bowls overnight, bags of pet food stored in garages, and chicken feed in backyard coops all provide exactly the kind of high-calorie, grain-and-protein mix rats prefer. Improperly stored garbage, compost bins with food scraps, and fallen tree fruit round out the list of common residential attractants. Storing birdseed and pet food in metal containers (not plastic, which rats can chew through) eliminates one of the easiest access points.
Water Matters as Much as Food
An adult rat drinks about 20 to 30 milliliters of water per day, roughly one to two tablespoons. While rats have efficient kidneys that let them survive on less, they’re strongly motivated to find reliable water sources. Leaky outdoor faucets, pet water bowls, birdbaths, and standing water in plant saucers can be just as attractive as food. Eliminating accessible water is an often-overlooked part of making your property less inviting.
Why New Bait Takes Time to Work
Rats are naturally suspicious of unfamiliar food, a behavior called neophobia. When a rat encounters something new, it stretches its neck toward the food, sniffs it, and takes only a tiny sample before retreating. If it doesn’t feel sick afterward, it comes back for more. In field studies, rats avoided new food significantly on the first day it appeared, approaching it last or sometimes not at all. By the second day, their wariness began to fade, and by the third day, they treated the new food the same as anything familiar.
This means that if you set a trap and nothing happens on night one, that’s completely normal. Pre-baiting (placing bait on an unset trap for two or three days) lets rats build confidence with the food source before you arm the mechanism. It also explains why poison bait stations often fail when moved to new locations: rats may avoid them for days simply because they’re unfamiliar, not because the bait itself is unappealing.
The Cheese Myth
Despite decades of cartoons, cheese is not a particularly strong rat attractant. Rats will eat it, and cheddar cheese has appeared on the menu in laboratory feeding studies alongside other foods. But when given a choice, rats consistently reach for fattier, sweeter, or more aromatic options first. Peanut butter, chocolate, or a piece of bacon will outperform a cube of cheese in a trap nearly every time. The sticky, spreadable texture of peanut butter also gives it a practical advantage that a solid chunk of cheese can’t match, since rats can often grab a piece of cheese and carry it away without tripping the trigger.