A ketogenic diet is not general proof that fewer carbohydrates are always better. It aims to change metabolism through substantial carbohydrate restriction. Decisions should consider not only ketones but also wellbeing, nutritional provision, blood results and whether the diet can be maintained.
A comparison with a Mediterranean diet
In the Keto-Med study, 40 randomized adults with prediabetes or type 2 diabetes followed two dietary patterns in a randomly assigned sequence, for twelve weeks each. Long-term blood glucose improved without a significant difference between the approaches. Triglycerides fell more with keto, while LDL cholesterol was higher and intake of certain nutrients and fiber was lower. [1]
This kind of study supports a nuanced assessment. A favorable change in one measurement does not automatically cancel an unfavorable change in another. The experience of a particular study population is not a personal treatment plan for everyone either.
| Area | What to clarify | What not to rely on alone |
|---|---|---|
| Goal | Weight change, blood glucose or another specific reason | The highest possible ketone level |
| Food choices | Which foods are removed and what replaces them? | Carbohydrate numbers alone |
| Progress | Tolerance and, where relevant, laboratory results | One early weight change |
| Everyday life | Shopping, shared meals, costs and restrictions | Short-term enthusiasm for a set of rules |
Think about replacements and everyday life before removing foods
First draw up a realistic example day. What will you eat at home, at work and when invited out? Simply replacing removed foods with arbitrary fatty products does not make the diet well planned. A product labeled keto does not answer questions about its full composition.
Also consider whether a less strict change would better address the real goal. Having fewer regularly sweetened drinks, for example, is different from avoiding all legumes and fruits. You do not have to choose the strictest approach to make more thoughtful meal choices.
Diabetes medicines change the safety question
Especially with SGLT2 inhibitors, also called gliflozins, a low-carbohydrate or ketogenic diet can increase the risk of diabetic ketoacidosis. With these medicines it can occur even when blood glucose is only moderately elevated or normal. [2] An unremarkable glucose reading alone is therefore not reassurance when someone feels significantly unwell.
Do not begin a highly restrictive diet during diabetes treatment without discussing it with the treating team. Do not independently reduce insulin or other medicines to fit an online template. Severe acute symptoms such as vomiting with abdominal pain, abnormal breathing or drowsiness require immediate medical assessment.
Success needs several criteria
A useful review asks whether the original goal is closer, whether symptoms have developed and whether the diet remains practical. Moving to a less restrictive approach can also be a sensible adjustment. Ketosis is not a personal performance test.
Frequently asked questions
Is keto automatically better than a Mediterranean diet?
No. Comparisons need to consider different outcomes and individual circumstances.
Does a high ketone level mean the diet is healthy?
No. It does not assess the complete menu.
May I adjust diabetes medicines myself to fit the diet?
No. Substantial dietary changes should be agreed with the treating team.
Must I remain strict despite poor tolerance?
No. Symptoms and practical difficulties are reasons to review the approach.
Further reading
Assess blood lipids in context and plan meals according to their composition.
Sources
Editorially updated: September 28, 2026. Not an individual diet or instructions for adjusting medicines.
