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I decided to quit sugar to lose weight after 18 years of teaching nutrition and still being exhausted, overweight, and miserable. I knew the science. I knew what I should be eating. And none of it mattered until the day everything changed, and it had nothing to do with counting calories.
It took ending up in a hospital at 42 thinking I was having a heart attack for me to finally apply what I had been teaching to everyone else. That night I made one decision. Cut out added sugar and processed carbs. No calorie counting. No points. No meal plan. Just that one change.
The weight started coming off almost immediately. And I finally understood why.
The Real Reason You Can’t Stop Eating
Most of us have been told that weight gain comes down to eating too many calories and not moving enough. If that were true, willpower would be enough. But for most people it isn’t, and there is a biological reason for that.
Dr. Jason Fung, a nephrologist and author of The Obesity Code, makes a compelling case that weight gain is primarily a hormonal issue rather than a calorie issue. The hormone at the center of it is insulin. When you eat sugar and refined carbohydrates, your blood sugar rises quickly, your body releases insulin to bring it back down, and over time with repeated spikes your cells can become less responsive to insulin. This is called insulin resistance, and when insulin is chronically elevated it signals your body to store fat rather than burn it.
What makes this even harder is what happens after that blood sugar spike. Biochemist Jessie Inchauspé, known as the Glucose Goddess and author of Glucose Revolution, explains that after a rapid rise in blood sugar comes a rapid drop, and your brain interprets that drop as an emergency. It sends out hunger signals even if you just ate an hour ago. That is not a lack of willpower. That is your biology responding exactly as it is designed to.
Processed food companies know this. Many ultra processed foods are specifically engineered to create that cycle of spike, crash, and craving so you keep eating. When you understand that, you stop blaming yourself.
What Happens When You Quit Sugar to Lose Weight
When I removed added sugar and refined carbohydrates from my diet, a few things happened.
The first 10 days were honestly hard. My body was used to sugar and it pushed back. The cravings were real and some days they felt relentless. But around day 10 something shifted. The cravings that had controlled me for years started to quiet down and it became so much easier after that. If you are in those first 10 days right now and struggling, please keep going. That turning point is coming.
Once I got through that window, my blood sugar stopped spiking and crashing as dramatically. I was no longer riding that roller coaster and I was no longer fighting hunger all day long.
My energy became steadier throughout the day. I had been so tired for so long that I thought exhaustion was just how life felt. It was not. Within a few days I noticed a difference. Within a few weeks I felt like a different person. If that constant tiredness sounds familiar, I wrote more about it here: Why You’re Exhausted All the Time and It Has Nothing to Do With How Much You Sleep.
The weight started moving. I lost several pounds in the first week, mostly water weight from reduced glycogen stores, which is completely normal. After that the loss slowed to a healthy and sustainable pace. I lost 65 pounds over about 15 months and have kept it off since.
This Is Not About Being Perfect
I want to be clear about something. I still eat foods that are not perfectly clean. I enjoy meals out. I have a small piece of dark chocolate when I want something sweet. I do not label food as good or bad because that kind of thinking creates guilt and an unhealthy relationship with eating.
What I did was crowd out the high sugar and high processed carb foods by eating more real food. More protein. More vegetables. More whole ingredients with fewer additives. When you fill your plate with things that actually nourish you, there is simply less room for the stuff that was driving your cravings in the first place.
Progress, not perfection, is what works long term.
One Place to Start Today
If you want to quit sugar to lose weight without overhauling your entire life, start with one meal. Look at your breakfast. If it is high in sugar or refined carbs, even something that seems healthy like certain cereals, flavored yogurts, or pastries, that is your first domino to change. A breakfast built around protein and whole foods sets a steadier blood sugar tone for the entire day.
You do not need to be perfect. You just need to start.
Want help spotting the hidden sugar and processed carbs in the foods you’re already eating? Grab my free ingredient guide here. It’s the same tool I use to make faster decisions at the grocery store and to read labels without getting overwhelmed.