All fat contains 9 calories per gram. A gram of either carbohydrate or protein contains 4 calories, and a gram of alcohol contains 7 calories. A gram is a unit of weight, and 1 gram is about the same weight as a standard paperclip.

An average double-meat hamburger can contain 31 grams of fat. Five grams of fat equals 1 teaspoon of fat. That means the double-meat hamburger has 6 teaspoons of fat, a little less than half of a healthy daily fat allowance for many people. But that doesn’t mean you can never eat such a food. Moderation allows an occasional sandwich like this.

The CDC recommends that you limit how much fat you eat to 20% to 35% of your daily calories.

A typical frank contains 13 gram of fat and 144 calories.

All cooking oils and shortenings are 100% fat and contain 13 to 14 grams of fat per tablespoon. Lard contains more saturated fat, which is found in meats and dairy products and may be more harmful to your heart. Vegetable oils are mostly monounsaturated and polyunsaturated fats, which are generally less harmful.

Surprisingly, switching to turkey will shave only 2.5 grams of fat. That’s because the real culprit in sandwiches are not lean meats but the cheese and regular mayo. By substituting tomato and lettuce for cheese and using no-fat mayo or mustard, you can lower the entire roast beef sandwich fat total to 7.5 grams.

One avocado has 30 grams of fat. More than half of the fat is monounsaturated, but the total includes 4.5 grams of saturated fat. This is still more saturated fat than two slices of Canadian bacon, a lean meat. Eight ounces of buttermilk has only 2 grams of fat.

If you step on the scale daily, you may notice a 2-pound increase, but that’s probably from temporary factors such as water retention, according to the USDA. You would have to eat 7,000 calories—that’s about 23 cheeseburgers—on top of your daily requirement to put on 2 pounds of fat.

Naturally occurring trans fats are made in the stomach or gut of some animals. A small amount of this type of trans fat may be found in milk and meats made from these animals. Artificial trans fats (or trans fatty acids) are made when food is processed, by adding hydrogen to liquid vegetable oils. This makes them more solid.

Trans fat has also been linked with an increased risk of developing type 2 diabetes.