Why “Calories In, Calories Out” Doesn’t Work So Simply When It Comes to Sugar
You’ve probably heard the phrase “calories in, calories out” when it comes to weight loss. In theory, it sounds simple: eat fewer calories than you burn and the weight should come off.
But when it comes to sugar, things aren’t always that straightforward.
A pattern I see often is women fasting or barely eating for half the day, then later consuming a large amount of sugary foods and assuming it balances out because the calories even out. The thinking goes something like this:
“I didn’t eat much earlier, so it’s fine.”
The problem is that your body doesn’t process sugar in such a simple, linear way.
When sugar enters the bloodstream, the body has to deal with it quickly. It can be used immediately for energy, stored in the muscles and liver as glycogen for later use, or—when those stores are full—converted and stored as body fat.
Large spikes in sugar also trigger insulin, the hormone responsible for moving glucose out of the bloodstream and into cells.
And this is where things begin to get more complicated.
The Craving Cycle Many Women Get Stuck In
When you go long periods without eating, blood sugar can drop. This makes the body far more vulnerable to intense cravings for quick energy.
When sugar is then eaten in large amounts, it creates a rapid spike in blood sugar, followed by a crash.
That crash often leads to more hunger, low energy, and a stronger drive to reach for quick carbohydrates again.
Over time, many women find themselves stuck in a loop that looks like this:
fast → cravings → sugar spike → crash → crave again
This cycle makes it much harder to regulate appetite, maintain steady energy, and make consistent food choices. What appears to be a “calorie problem” is often actually a blood sugar stability problem.
The Beliefs That Keep Us Stuck
One of the biggest reasons people struggle with weight, energy, and overall health isn’t just calories or lack of exercise — it’s the belief patterns we hold around food, especially sugar and carbs.
Many women tell themselves things like:
- “I don’t eat sugar — I eat savoury foods.” (But remember, carbs break down into sugar in the body.)
- “I missed a meal earlier, so I can afford to eat whatever I want now.”
- “I’ll fast or skip meals to control my weight.”
The problem is, when you skip meals or go long periods without eating, your body gets hungry and stressed. Willpower declines, blood sugar drops, and suddenly your brain is screaming for fast fuel. That’s when the sugar and quick carbs in the form of junk food feel irresistible — and almost inevitable.
These beliefs create a loop where intention and behaviour don’t line up: we try to “control” our eating, but the very strategies we use—fasting, skipping meals, relying on rules—actually drive cravings and overeating.
Breaking this cycle isn’t about restriction or willpower. It’s about understanding how your body actually works, and building habits that give it steady energy, stabilise blood sugar, and quiet the cravings before they take over.
Why This Becomes Even More Important for Ageing Women
For women in their 40s, 50s and beyond, the conversation about sugar becomes even more important.
Hormonal changes during perimenopause and menopause can make the body more prone to insulin resistance.
Insulin’s job is to move sugar from the bloodstream into cells so it can be used as energy. When insulin resistance develops, the body has to release more and more insulin to manage the same amount of sugar.
Over time this can lead to:
- increased fat storage (particularly around the abdomen)
- unstable energy levels
- stronger sugar cravings
- difficulty losing weight
Long-term habits of frequent sugar spikes—especially when combined with stress, poor sleep, and inconsistent eating patterns—can gradually push the body toward type 2 diabetes.
This process develops slowly over years, not overnight.
The Role of Emotional Eating
For many women, sugar consumption is closely tied to emotional eating.
Stress, overwhelm, loneliness, or exhaustion can drive the body to seek quick comfort and energy. Sugar triggers dopamine in the brain, which is why it can feel calming or rewarding in the moment.
But the relief is temporary.
As blood sugar rises and then falls again, cravings return—often stronger than before.
This creates another loop many women recognise:
stress → sugar → temporary relief → energy crash → more cravings
This is why emotional eating often feels so difficult to control. It isn’t simply a lack of discipline. In many cases it’s a biological and emotional feedback cycle.
Understanding how sugar affects your body is the first step toward breaking that pattern.
Stabilising Blood Sugar: The Real Foundation
When women begin supporting their bodies with more stable nutrition patterns, something important starts to happen.
Eating regular meals, focusing on adequate protein, and including whole foods that stabilise blood sugar can dramatically reduce energy crashes and cravings.
And when blood sugar stabilises, the constant battle with food often becomes much quieter.
Why Protein and Strength Training Matter So Much
One of the most powerful ways to stabilise blood sugar and improve metabolic health is by building and maintaining muscle.
Muscle tissue plays a major role in how the body processes glucose. The more healthy muscle mass you have, the better your body can store and use glucose rather than allowing it to circulate in the bloodstream.
This is why two key pillars of long-term health are:
- adequate protein intake
- regular strength training
Protein helps maintain and build muscle tissue, supports appetite regulation, and helps keep blood sugar more stable after meals.
Strength training improves insulin sensitivity and allows muscles to store more glycogen, meaning the body becomes more efficient at handling carbohydrates.
Together, these habits help create a body that is stronger, more metabolically healthy, and far less prone to constant cravings.
The Goal Isn’t Restriction — It’s Stability
This isn’t about cutting out sugar completely or following restrictive diets.
It’s about understanding how your body works and building habits that support it.
For many women, this means shifting away from extreme patterns like fasting all day and then eating large amounts of quick carbohydrates, and instead building a routine that includes:
- regular meals (3 meals and 2 snacks daily)
- adequate protein (double your bodyweight in grams of protein)
- strength training (2-3 times per week)
- consistent habits that support energy and wellbeing
Because when your body is fuelled properly, health stops feeling like a constant battle.