What happens when you stop eating added sugar

Board-certified sports dietitian Tara Collingwood says your body doesn’t need a “sugar detox,” and changes after cutting added sugar can include steadier blood sugar, shifting cravings, and adjustments in energy and taste.

According to Tara Collingwood, MS, RDN, CSSD, LD/N, ACSM-CPT, a board-certified sports dietitian and co-author of Flat Belly Cookbook for Dummies, the idea of a “sugar detox” is unnecessary because the body already has a detox system.

“What happens is your body adjusts to lower added sugar intake, and it can feel dramatic, especially at first,” Collingwood said.

Within the first hour

Within the first hour after stopping added sugar, Collingwood said you may notice a rapid change sometimes described as a “sugar crash.”

“Blood sugar rises less (especially if you’re used to sugary foods),” Collingwood said.

She also said the insulin response can be lower and more stable, and that “You may feel less energy ‘crashing’ later,” Collingwood said.

After the first day

After one day without sugar, Collingwood said blood sugar levels can become more stable throughout the day. She cautioned, however, that some people may experience side effects such as headaches, irritability, and strong cravings.

“This is less about ‘withdrawal’ and more about your brain adjusting to less dopamine stimulation from sugar,” Collingwood said.

After a week

After a week, Collingwood said the body may begin to stabilize. She noted that “The cravings often begin to diminish,” and that “the taste buds begin to reset,” Collingwood said.

“Foods can taste sweeter naturally,” Collingwood said.

She added that energy may feel more consistent and that some people notice digestive changes, including “improved digestion or less bloating,” Collingwood said.

After a month

After a month without added sugar, Collingwood said people may experience improved blood sugar control and insulin sensitivity, particularly “if added sugar intake was high before.”

She also said possible outcomes can include reduced risk factors for metabolic problems, possible weight changes—“especially if sugar was a major source of calories”—and a more stable mood with fewer energy dips.

How long does it take to “detox” from sugar?

Collingwood said adaptation typically takes three to seven days for cravings to ease, and two to four weeks for more noticeable metabolic and taste changes.

Here’s what she recommends

Rather than cutting all sugar at once, Collingwood recommended a gradual, sustainable approach. “Rather than abruptly cutting out all sugar, a sustainable approach works better,” she said.

She said the first step is to focus on eliminating added sugar, not natural sugar, and that “Keep fruit, dairy, etc,” Collingwood said.

She also advised reducing soft drinks, sweets, pastries, and sweetened drinks.

Collingwood said meal composition matters: “Combine carbohydrates with protein and fat. This helps stabilize blood sugar and reduce cravings.”

She added that regular eating can help manage cravings. “Skipping meals can worsen sugar cravings,” Collingwood said.

She also emphasized hydration, saying, “Dehydration can feel like sugar cravings.”

Finally, Collingwood said a restrictive mindset isn’t necessary. “An ‘all-or-nothing’ approach often backfires,” she said. She concluded that reducing added sugar can improve energy, mood, and metabolic health, while noting, “your body is not ‘toxic’ from sugar. It’s about retraining the palate and stabilizing blood sugar, not cleansing your system.”