Some people cut carbohydrates and feel sharper within a fortnight. Others cut them and become progressively colder, flatter and more prone to waking at three in the morning. Both are real. The difference is usually constitutional, and it is worth knowing which one you are before you commit to a year of it.
The advice has become unusually one-directional
Low-carbohydrate eating has good evidence behind it for particular purposes, and for a subset of people it works well. That is not in dispute here.
What has happened alongside that is a cultural drift in which carbohydrate has become a category to be minimised by default, regardless of who is doing the minimising. White rice in particular has acquired a reputation that is out of proportion to what it is.
We see the consequence in clinic often enough to write about it: people who have removed warm cooked grain from their diet entirely, on general principle rather than for a specific indication, and who have gradually become colder, more tired and less well.
What warm cooked grain does in the classical reading
In classical terms, warm cooked grain is one of the least demanding things you can ask a digestive system to process. Congee — rice cooked long in plenty of water — is what is given after illness, after childbirth, and to people whose digestion has very little capacity, precisely because it asks almost nothing and gives something usable.
That is the property that gets removed when grain comes off the plate. Not calories — those are easily replaced with fat and protein. What is removed is a warm, easily processed source of fuel, and it is typically replaced with foods that ask considerably more of the digestion: more fat, more animal protein, and often more raw vegetable matter.
For someone with digestive capacity to spare, that trade is manageable. For someone already running low, it is not.
Who tends to struggle with it
The pattern is fairly consistent.
Cold hands and feet that get colder over the months of restriction. Fatigue that deepens rather than lifting after the initial adjustment period. Waking between two and four in the morning. Feeling worse rather than better on an empty stomach. For women, periods becoming lighter, later or more painful. A general sense of having less to draw on.
If that describes your experience of low-carbohydrate eating, the diet is not failing to work — it is working on a body that had a different requirement.
Related: Chronic Fatigue Syndrome, Cold Hands & Feet, Insomnia & Sleep Disorders.
What we look at
Heart Drive — the mechanism that turns warm, accessible fuel into usable energy. Restriction in someone already low here tends to compound the deficit, because warm accessible fuel is exactly what that mechanism uses.
Fluid Flow — where drainage is sluggish, the picture is different. Some of these people genuinely do better with less starch, and report feeling lighter and clearer. This is the group for whom low-carbohydrate eating tends to suit.
Same diet, opposite outcomes, entirely predictable from the pattern.
Not all carbohydrate is one thing
The public conversation treats it as a single category, which is where a lot of the confusion comes from.
A bowl of warm cooked rice and a soft drink are not the same event, in classical terms or in any other. Warm and cooked is gentler than cold and raw; simple and plain is gentler than rich and complex. Congee sits at the gentlest end of the range.
If you are reducing, reducing refined sugar and cold sweet foods is a different proposition from removing warm cooked grain, and the two are often conflated.
Important limits on what this means
If you have diabetes, your carbohydrate intake is a medical matter managed with your GP, dietitian or endocrinologist. Nothing here changes that, and if you take glucose-lowering medication, changing intake without adjusting the plan with your doctor carries real risk of hypoglycaemia.
If you are on a therapeutic ketogenic diet for epilepsy or another indication, that is a supervised medical treatment and belongs with the team supervising it.
If you are restricting to lose weight and it is working and you feel well, this article is not an argument against what you are doing.
When to seek medical care
- Fatigue that persists beyond a few weeks — thyroid, anaemia, coeliac disease and diabetes all present this way and need excluding
- Periods becoming irregular, very light, or stopping — this warrants medical assessment, particularly alongside restriction or weight loss
- Unintentional weight loss, dizziness on standing, or fainting
- Feeling compelled to restrict, distress around eating, or restriction that has become difficult to stop — please speak to your GP. If food and eating have become a source of significant distress, the Butterfly Foundation National Helpline is 1800 33 4673, open seven days, 8am to midnight (AEST/AEDT).
Helpful Habits
- ✓ Warm cooked breakfast — congee is the gentlest option if digestion is poor
- ✓ Judge by how you feel over a month, not by the scale over a week
- ✓ If cold and fatigue are increasing, treat that as information rather than as an adjustment period
- ✓ Keep your GP in the loop on any significant dietary change
Best Avoided
- ✗ Removing a food group indefinitely on general principle rather than for a reason
- ✗ Changing intake while on glucose-lowering medication without your doctor
- ✗ Pushing through months of increasing cold and fatigue
- ✗ Treating warm cooked grain and refined sugar as the same thing
In summary
The useful question is not whether carbohydrate is good or bad. It is which pattern you have. One pattern generally does better with less starch. Another gets progressively colder and flatter without warm cooked grain — and that group is currently being given advice designed for the other one.
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About this article
Who: Dr. Valen Yang, AHPRA-registered Chinese Medicine practitioner. Registered with the Chinese Medicine Board of Australia.
How: Classical pattern-differentiation framework and clinical observation. Presentations described are composites; no individual patient is identified. Drafting assistance was used for structure and language; all clinical content was reviewed and approved by Dr. Yang before publication.
Why: Patient education. Not a substitute for advice from your GP or dietitian.
Last reviewed: 20 July 2026 by Dr. Valen Yang