205 mg/dl at the beer garden: beer, steak, salad: who was the culprit?

What happened

The day started early: breakfast at 06:40, then a business appointment until 12:30, then stressed to the station to see off a colleague. Notably, my morning was without training, which is untypical for me. Into the evening the curve stayed calm between about 105 and 150 mg/dl.

Then at 19:40: 201 mg/dl with a steeply rising arrow. Two minutes later 205. Shortly before: the lager, the pepper steak and the extra salad.

Suspect 1: the beer: surprisingly innocent

My first suspicion was the beer. But the nutrition largely clears it: Löwenbräu Original Hell contains about 3.1 g carbs per 100 ml per its nutrition info, of which only ~0.1 g sugar, at 5.2% alcohol.¹ For 0.5 l that’s around 15.5 g carbs and about 0.5 g sugar. That’s little, and doesn’t explain a jump from ~105 to 205 mg/dl on its own.

Interesting is the opposite direction: alcohol tends to slow the liver’s sugar release, so for many it tends to lower the value. Here the beer was probably a supporting actor, not the lead.

Suspect 2: the salad: more precisely, its dressing

This is exactly where my own suspicion lay, and the numbers support it. “Salad” sounds harmless; the dressing often isn’t. Market surveys not uncommonly show more than 15 g sugar per 100 ml in ready-made dressings; for balsamic dressing around 60 g sugar per 500 ml was found, for French dressing about 45 g per 500 ml.² Even light balsamic is often sweet, because sugar is added to it.³

A generous portion of dressing on an “extra salad” can thus easily deliver 10–20 g of fast-available sugar: liquid, without a braking fibre matrix, well absorbed. That fits the speed of my rise much better than the beer.

Suspect 3: the pepper sauce

The steak itself contains practically no carbs. The sauce, by contrast, often comes thickened (flour or starch) and sometimes sugared, a classic among the hidden carb sources in a restaurant. Exactly how much, only the kitchen knows. This too remains a guess.

Suspect 4: the day around it

What’s easily overlooked: the context was unfavourable. A long appointment, then stress on the way to the station, and a day without my usual training. Stress can raise blood sugar without any food; and without training the muscular “uptake capacity” for glucose is missing. These factors don’t explain the peak alone, but they make an already sugary evening more intense.

What helped: a 3 km walk

Instead of dwelling on it, I set off: about 3 km in 30–35 minutes, easy pace. Afterwards the value normalised again. That matches what reliably works for me. I’ve documented it several times (e.g. about 3 km in 40 minutes at 96 mg/dl on another day). Easy movement is my best tool after an unexpected rise.

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