Many people who struggle with their weight also struggle with their sleep. I see it a lot in my coaching — when someone isn’t sleeping well, everything feels harder. Poor sleep can make cravings stronger, decision-making tougher and energy levels unpredictable. Over time, this becomes a cycle that keeps people stuck.
Most of the research looks at how sleep affects diet choices. But there’s another important angle we don’t talk about enough: how your diet and weight-loss efforts can influence your sleep.
A recent study explored exactly that, and I want to share the findings with you in a simple way, plus how I help clients improve both their sleep and their health through everyday habits.
Why Sleep Matters When You’re Trying to Lose Weight
When you’re not sleeping well, your hunger hormones go out of balance. You feel hungrier, you crave sugary foods, and your body has a harder time regulating blood glucose. That means even the best intentions around food and training feel harder to stick to.
Around a third of adults aren’t getting enough sleep, both in the US and here in Australia. Many people struggle with falling asleep, staying asleep or waking up feeling rested.
Poor sleep is linked to obesity, stress, low mood and a range of long-term health issues. But the good news is: improving your sleep can also improve your overall health and support your weight-loss goals.
What the Research Looked At
Researchers wanted to understand whether eating a calorie-restricted diet — specifically one with higher protein — could improve sleep quality in overweight adults who already slept poorly.
Here’s a quick summary in plain English:
- Duration: 14-week study
- Participants: 51 adults aged 30–69, BMI 25–39
- Diet: A Healthy US-Style Eating Pattern with a daily 750-cal deficit
- Groups:
- Recommended protein (RP): 5oz/day
- High protein (HP): 12.5oz/day (mainly animal-based)
- Measurements: Sleep quality (subjective and objective), daytime sleepiness, sleep efficiency
Participants were screened carefully, and those with sleep apnoea, diabetes, acute illness or pregnancy were excluded.
What They Found
Across the whole group, participants lost an average of 6.2 kg. But here’s the interesting part:
Protein intake didn’t change sleep quality — but weight loss did.
People in both groups experienced:
- Better sleep efficiency
- Lower daytime sleepiness
- Improved overall sleep quality
The average global sleep score went from 7.6 (poor sleep) to 4.8 (good sleep). That’s a meaningful shift for anyone trying to build healthier habits.
So whether protein was high or moderate didn’t matter. What mattered was that the participants were eating well, creating a calorie deficit, and losing weight in a structured way.
What This Means for Your Health & Fitness Journey
This study backs up what I see every day with my clients: when you start eating better, moving more and taking care of yourself, your sleep naturally improves.
And when your sleep improves, everything else becomes easier:
- Cravings settle down
- Your mood lifts
- You’ve got more energy for training
- You stay more consistent
- You feel clearer and more motivated
The body works best when everything — sleep, nutrition, movement and mindset — supports each other.
Limitations to Keep in Mind
- Participants knew their sleep was being monitored, which may have created a placebo effect
- More women than men participated
- The high-protein group had higher drop-outs
- Because it was a free-living study, researchers couldn’t guarantee participants only ate provided foods
Even so, it gives us good insight into how changing your lifestyle can genuinely help you sleep better.
How I Help Clients Improve Sleep While Losing Weight
- Eating balanced meals — I help you find a routine that supports steady energy and reduces late-night overeating.
- Regular movement — Even light movement helps regulate stress, blood sugar and sleep hormones.
- Managing stress — I support you inside and outside our sessions through messages, check-ins and our Aspire Groupies community.
- Building long-term habits — Sustainable weight loss leads to better sleep, and better sleep supports long-term results.
Whenever you’re ready to work on your fitness, sleep or overall health in a simple, supportive way, I’d love to help you get started.
