There Might Be a Genetic Reason for Your Sweet Tooth, According to New Research

Preliminary research offers clues about what may shape your cravings for sweets.

New research indicates genetics may influence how strongly you perceive sweetness and how rewarding sweet foods feel, which can shape your food preferences and eating habits.

A preliminary study of nearly 500,000 people found that those with a higher genetic predisposition to prefer sweets ate about 7 grams more of sweet foods each day. Dietitians suggest that choosing naturally sweet foods, pairing sweets with protein or fiber, and gradually reducing added sugar can help you manage a preference for sweets.

The difference between happily skipping dessert and reaching for another cookie may start with how you experience sweetness. Some scientists say the answer may partially lie in your DNA.

Early research from the Center for Genomic Medicine at Massachusetts General Hospital suggests that genetics may help shape taste preferences, influencing what people choose to eat and potentially their body weight and risk of type 2 diabetes. However, the findings are preliminary; they were presented at the American Society for Nutrition’s annual meeting and have not yet undergone peer review for publication in a scientific journal.

Researchers compared data from nearly 500,000 people who participated in the United Kingdom Biobank, a large-scale biomedical database. They compared participants’ responses to a questionnaire about food preferences with their genetic data. By combining the two, they created scores reflecting a person’s genetic predisposition to prefer certain tastes (sweet, salty, and fatty) and then examined whether those genetic tendencies were linked to the foods people reported eating.

They found that people with a greater genetic predisposition toward sweet taste consumed about 7 grams more sweet foods per day on average, while genetic preferences for sweet and fatty foods were also associated with higher body weight and a modestly increased risk of type 2 diabetes. Researchers say the findings could eventually inform more personalized nutrition strategies.

“Although 7 grams sounds trivial, it adds up over time when it’s a daily or regular habit,” says Nneoma Oparaji, MD, a triple board-certified physician in internal medicine, obesity medicine, and lifestyle medicine. She explains that these eating patterns can contribute to excess calorie intake, which may increase the risk of weight gain, insulin resistance, type 2 diabetes, and other metabolic conditions over time.

Does Fructose ‘Feed’ Cancer? Here’s What the Research Actually Says This doesn’t mean your taste preferences are predetermined. Genetics are just one factor that can influence how the taste system functions and how strongly you perceive certain flavors, Oparaji explains. “Genes provide instructions for receptors involved in detecting sweet, bitter, salty, and sour, and genetic variants alter receptor function and taste, which means that the same food can taste differently among people.”

Researchers have identified multiple genetic variants associated with a preference for sweet tastes, which means no single gene determines whether you reach for another cookie or skip dessert. Instead, a combination of genetic differences may influence both how you perceive sweetness and how your brain responds to it. Here’s how this works, according to Oparaji.

Sweet compounds activate a taste receptor made from the TAS1R2 and TAS1R3 proteins on taste-receptor cells. Genetic differences that affect this pathway can change how strongly people perceive and respond to sweet tastes. For someone who is more sensitive, a small amount of sugar may provide plenty of flavor, while someone with lower sensitivity may seek out sweeter foods to get the same level of satisfaction.

A sweet tooth isn’t just about what happens on your tongue; it also involves how your brain responds to taste signals. Eating something sweet can activate brain pathways involved in pleasure and reward, and genetic differences may influence how strongly those pathways respond. This could help explain why the same dessert is far more satisfying to one person than to another.

Because this research is preliminary and has not yet undergone peer review, the findings do not establish that certain genetic variants cause obesity or type 2 diabetes. Rather, they suggest that genetics may influence food preferences via taste perception, appetite regulation, and the brain’s reward response to food. Over time, those effects could shape eating patterns associated with a higher risk of these conditions, like eating more sweet foods.

Someone with a genetic predisposition to prefer sweet or high-fat foods, Oparaji explains, may be more likely to choose them regularly. Although that preference alone doesn’t determine a person’s health, frequently eating foods high in added sugar and fat can contribute to consuming more calories than the body needs.

“The genes could influence the preference, the preference can influence the plate, and over time, the plate influences metabolic health,” Oparaji says.

Genetics, however, are only one part of a much larger picture. Food availability, physical activity, sleep, and other lifestyle factors can also influence long-term metabolic health, says Sarah Amidon, RDN, a registered dietitian nutritionist and founder of Root and Fruit Nutrition.

Not all sugar in food is the same. A piece of fruit, for example, contains naturally occurring sugar along with fiber, vitamins, minerals, and other nutrients, so it isn’t nutritionally equivalent to a food with the same amount of added sugar. Here’s the difference:

Naturally occurring sugars: These are found naturally in foods such as fruit and dairy, which can also provide nutrients such as fiber, protein, vitamins, and minerals.

Added sugars: These are sugars added to foods and drinks during processing or preparation. Common sources include soda, candy, sweetened coffee drinks, baked goods, and desserts.

A genetic tendency to prefer sweet or highly palatable foods doesn’t determine your long-term health. Small, practical changes can help you make more nutritious choices without taking a one-size-fits-all approach or giving up the foods you enjoy. Here are some helpful strategies, according to Oparaji and Amidon:

Choose naturally sweet foods. Fruit and low-fat yogurt can satisfy a craving for sweetness while also providing nutrients like fiber, vitamins, and protein.

Pair sweets with protein, fiber, or healthy fats. Combining foods with different macronutrients may help make a snack more filling and satisfying. Try berries with Greek yogurt or fruit with a small handful of nuts.

Make the healthier choice the easiest choice. Keep nutritious snacks visible and easy to grab while storing tempting sweets out of reach and buying them in smaller portions.

Identify your craving triggers. Pay attention to when you tend to reach for sweets. Do cravings show up when you’re stressed, bored, or watching television? Recognizing these patterns can make it easier to turn to alternatives, such as taking a short walk, having a cup of tea, or choosing a more nutrient-dense snack.

Play with spice. Spices such as cinnamon, cocoa, and nutmeg can add flavor to desserts without requiring added sugar.

Rethink sugary drinks. Swap soda, sweet tea, and sugar-heavy coffee drinks for water, sparkling water, or a low- or no-calorie alternative.

Don’t rely on willpower. Rather than keeping sweets within easy reach and eating them impulsively, consider planning a reasonable portion of a favorite dessert. This allows you to enjoy sweets while being more intentional about how often and how much you eat.

Read nutrition labels. Foods that look similar can contain very different amounts of added sugar, so check nutrition labels and choose options with less sugar.

Make changes gradually. You don’t have to eliminate sugar overnight. For example, if you normally use two teaspoons of sugar in your coffee, try one and a half, then gradually reduce the quantity further. Over time, your palate can adjust to less sweetness.

A couple months ago I gave a blood sample for a genetics mega study (at age 76 I don’t have much to lose). I didn’t have any of the disease markers they were tracking but instead of paying me they did a traits and ancestry breakdown. In addition to brown eyes, can smell asparagus, don’t care for cilantro, I also am not particularly attracted to sugar. Not sure what to do with all this knowledge but there it is. Already knew I was half Italian but did not know I was 10% Persian and 2% Ashkenazi Jew. Like most folks a walking melting pot. Can’t see any grievance grifts I qualify for.

6 posted on 09/04/2026 6:41:30 PM PDT by Does so (Book:"The Party of Death"...Dem☭¢rats ™ ® © ≣ ½⅓⅔¼¾ ⅛⅜⅝⅞ ⅓ ⅕ ⅖ ⅗ ⅘ ⅙ ⅚)

I’ll always choose carbs before sugar. I know they both result in sugar. A choice between potato chips and cake, I’m taking the chips. Pasta before pie.

8 posted on 09/04/2026 6:45:01 PM PDT by MayflowerMadam (In the end, we will remember not the words of our enemies, but the silence of our friends.)

For those unfortunates who taste dish soap when they eat cilantro, there’s always parsley with lime zest or Thai basil.

Don’t rely on willpower.

Rely on mental illness. Some slim women choose from various eating disorders as their method of weight control.

Of course we have a sweet tooth, even my dog. It is all about survival. Ages, past our day-to-day existence was about protein and calories. We killed, we hunted, we fished and much later farmed, thus the sweet tooth. It is all about survival. Carbohydrates grains in effect are sugar as they are quickly converted to such via our livers and if in excess to fat. High sugar content plants such as sugar cane and sugar beets were the best.

11 posted on 09/04/2026 9:39:01 PM PDT by cpdiii (cane cutter, deckhand, oilfield roughneck, drilling fluid tech, geologist, pilot, pharmacist, MAGA)

Of course we have a sweet tooth

Many poisons have a bitter taste. Humans have one primary sweet receptor built from two genes, but up to 25 genes used for tasting different poisons. About 90% of hunted animals are edible, however about 90% of plants have various don't-eat-me-ever-again defenses.

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