Breakfast: The Most Important Meal of the Day. Or the Best Marketing Campaign?
What cereal manufacturers, longevity scientists and our anxious minds can teach us about making informed choices.
Apparently, even breakfast has become another opportunity to get life wrong.
Eat it, and you might be ruining your fasting benefits. Skip it, and you might be damaging your metabolism. Choose the wrong cereal, and goodness knows what you've done to your blood sugar.
All this before 9 am.
I've been curious about breakfast for some time. Who decided it was essential? What does the science actually say? And why do we so readily turn health advice into another set of rules?
I'm a biologist, an educator and a therapist, not a nutritionist. But I'm a scientist by training, and I like asking questions — particularly when something we've been told all our lives starts sounding suspiciously like an unquestionable truth.
So I did some reading.
Did the Kellogg brothers invent breakfast to sell us cereal?
According to one popular story, two enterprising brothers invented breakfast, convinced everyone it was essential, and made a fortune selling cornflakes.
An excellent conspiracy. Unfortunately, history is less cooperative.
Humans have eaten breakfast for thousands of years. The Kellogg brothers helped popularise ready-to-eat cereals, not breakfast itself.
John Harvey Kellogg was a physician with some rather unusual ideas about health and morality. His brother Will recognised the commercial potential.
Then, in the 1920s, public relations pioneer Edward Bernays helped promote bacon and eggs as a hearty breakfast, using doctors' opinions to give the campaign medical credibility.
Brilliant marketing. Not quite a clinical trial.
Popular beliefs, even very old ones, aren't necessarily supported by good science.
But aren't breakfast cereals healthy, especially for children?
That depends on what's in the bowl.
Kellogg's Frosties contain approximately 37% sugar. A standard 30 g serving provides about 11 g of sugar and just 0.6 g of fibre.
Coco Pops contain less sugar — around 17 g per 100 g — but still provide relatively little fibre.
Both contain added vitamins and minerals. Useful, certainly. But adding vitamins to a sugary cereal doesn't automatically make it an ideal everyday breakfast.
England's government-funded school breakfast programme recommends lower-sugar, higher-fibre cereals, plain porridge and fruit. Its standards exclude certain heavily sweetened breakfast products.
For a child arriving at school hungry, a nutritious breakfast may genuinely help. But surely we should pay at least as much attention to what children are eating as to whether they've eaten at all?
The quality of breakfast matters more than its reputation.
Is skipping breakfast actually better for us?
For years, we've been told that missing breakfast slows metabolism and makes us overeat later.
But a 2019 review of 13 randomised trials, published in The BMJ, found no convincing evidence that eating breakfast helps with weight loss. Participants assigned to eat breakfast consumed, on average, approximately 260 more calories per day.
The studies had limitations, but the familiar rule was looking rather less convincing.
Then there's David Sinclair, the Harvard scientist studying longevity. Among his many approaches to healthy ageing, he practises intermittent fasting, significantly delays his first meal and has reported biological-age estimates considerably younger than his chronological age.
And, admittedly, he does look remarkably youthful.
But looking younger, having impressive biomarkers and proving that skipping breakfast extends human life are three different things.
Much of his influential research has involved yeast, mice and cellular mechanisms. Fascinating science — but mice have yet to publish dietary guidelines for humans.
A major 2025 review found that intermittent fasting generally produced weight and metabolic outcomes similar to conventional calorie restriction. Some research even suggests that eating earlier in the day may be metabolically preferable.
Skipping breakfast may suit some people. But it isn't a scientifically proven shortcut to weight loss or a longer life.
But surely breakfast is important for some people?
Imagine three people.
A healthy 45-year-old office worker who isn't hungry until 11 am.
A 15-year-old student facing a morning of lessons and examinations.
A 75-year-old woman struggling to maintain her weight and muscle mass.
Would you give all three identical advice?
Of course not.
Children, older adults, athletes and people with certain medical conditions may particularly benefit from regular morning meals. Others may feel perfectly well without them.
And what we eat matters. Eggs, oats or plain yoghurt with nuts provide a very different nutritional combination from a bowl of sugary cereal.
There is no universal breakfast rule. Individual needs and food quality matter.
Why does even breakfast become something to worry about?
This is where my professional interest really begins.
I work with people experiencing anxiety, overthinking and self-doubt. And I see how easily information becomes another obligation.
You must eat breakfast.
You must skip breakfast.
You must fast for 16 hours.
You must never eat after 6 pm.
Our anxious minds love certainty. Give them two conflicting health headlines, and they'll work overtime trying to discover which one guarantees safety.
But science rarely offers guarantees. It offers evidence, probabilities, limitations and sometimes a perfectly respectable we don't know yet.
Whenever you catch yourself thinking I absolutely must, it may be worth asking: Says who? And based on what evidence?
Critical thinking doesn't mean researching everything until you're exhausted. It means recognising when you have enough information to make a reasonable choice, even without absolute certainty.
Good information should give us more freedom to choose, not more reasons to worry.
So, breakfast tomorrow?
Personally, I've experimented with different approaches, including intermittent fasting. I've also discovered that changing a habit isn't particularly difficult when I have a good reason to do it.
These days, I prefer something simpler: eating when I'm hungry rather than when the clock tells me to, and gradually improving the nutritional quality of my food. For me, that seems to work rather well for maintaining a healthy weight and a clear head.
No dramatic transformations. No complicated rules. And certainly no ambition to become a nutrition influencer.
Of course, individual needs differ. Some people benefit from regular morning meals, and medical conditions or a history of disordered eating may require a different approach.
You don't need to follow Sinclair's routine, Kellogg's marketing or the latest enthusiastic stranger on Instagram.
You can examine the evidence, make a reasonable choice — and change your mind when better evidence comes along.
That's not indecision. That's psychological flexibility.
Freedom doesn't mean finding the perfect rule for living.
Sometimes it means realising you don't need another rule at all.
Your breakfast is a choice, not a test you have to pass.
Research and sources
Sievert et al., The BMJ (2019) — Systematic review of randomised trials examining breakfast, energy intake and weight.
The BMJ (2025) — Systematic review and network meta-analysis comparing intermittent fasting strategies with conventional dietary approaches.
Department for Education — Free Breakfast Clubs Guidance (2026).
