Low-carb diet causes blood test abnormalities after 18 months

18 Months Without Flour: When Blood Tests Start Failing

What happens when blood tests that improved after cutting bread worsen again 18 months later? This is the case opening this discussion. A person with genetically high uric acid eliminated flours and sugars for 18 months, under the supervision of a nutrition professional and with periodic blood and urine controls. Initially, everything aligned: uric acid, which was near the upper limit, stabilized. But in the last two months, urea skyrocketed, uric acid exceeded the limit again, and ALT (GPT), which had never caused problems, surpassed the maximum. Their conclusion is not a prescription, but a warning: anyone changing their diet must monitor themselves with blood tests at least three times a year.

What Someone Eating Low-Carb Consumes

Details matter, and half are missing here. The affected individual's account describes their pattern: no flours, carbohydrates only from fruit and vegetables, zero sugar except daily fruit and honey almost every day, with beer outside this script. Protein, however, became much more abundant than before. Upon seeing the results, they reduced protein intake "significantly" and increased carbs to try to correct the trend. No one has published the gram breakdown or macronutrient percentages, and this absence is exactly what critics demand: without knowing how much they ate before and now, any conclusion hangs in the air.

Why Does Urea Rise When Carbs Are Cut?

Because removing carbs has no direct relation to urea: what spikes it is excess protein and lack of water to eliminate it. This is the most repeated argument when analyzing the case. In high-protein diets, one must drink lots of water—liters—and natural diuretics like coffee help, until urine is clear. Another interpretation goes in the opposite direction: urea, uric acid, and ALT are multipurpose parameters; high levels can be due to many causes and, in the described values, would indicate a mild warning rather than an alarm. Among hypotheses, paracetamol or alcohol also slip in as factors to rule out before redoing the analysis.

The Mistake of Replacing Carbs with Protein Instead of Fat

The dominant thesis argues that the problem wasn't removing bread and pasta, but what filled the gap. Swapping carbs for protein punishes kidney and liver; the natural substitute should be quality fat, not steak. Regarding fruit and honey, there is uncomfortable consensus: it is sugar, however you look at it, and the body translates it the same way. Added to this is a logical contradiction launched against the narrative itself: one cannot eat both high protein and high fat simultaneously, because one of the two macros will never be as high as claimed. The requested breakdown—typical menu, percentages before and after—still hasn't appeared, and without it, each side places the figure that suits them.

Figures Each Side Uses as Flags

Defenders of high-carb diets rely on statistics: patterns that have historically given the best results include carbohydrates starting from 60%, fats below 20-25%, and little presence of animal products. Opposite, the contrary current recalls that official guidelines set a cap of 15% for protein and that, without renal issues, that ceiling could be doubled without consequences. In between, peoples like the Inuit and Hunza are cited as references, and even the last decimal of their longevity is discussed. None of those societies serve as clinical trials, and that is where the exchange of studies stops advancing.

Cases with Impeccable Tests After Years Without Carbs

The individual account is not unidirectional either. Facing the case opening the discussion appears another: over three years of well-executed ketogenic diet, with checks every six or nine months, correct blood tests, and insulin resistance and polycystic ovaries resolved after eleven years of hormonal treatment. The narrator assures the recommendation came from an endocrinologist. The other half of the argument focuses on habits more than genes: predisposition loads the weapon, what one eats pulls the trigger.

Two dinners from the same conversation: someone who started by removing flours to lower uric acid and ended up adding them to lower urea, and someone who has gone three years without touching them with textbook analyses. The body, says the first, has been warning in writing. The only thing no one disputes—neither the most frugivorous nor the most carnivorous—is the boring part: getting tests done and reading them.