Episode 6 - When My Kidneys Filed a 2 AM Complaint for 2 Meals a Day

 Another field note from an engineer who discovered that simplifying the meal schedule does not necessarily simplify the plumbing.

If you are new to this journey

If you have not had a chance to read my earlier posts, I recommend starting from Episode 1 and following the journey in sequence. Each episode led naturally to the next one, much like debugging a system where every fix seems to uncover another interesting problem.

Here are the five episodes so far:

Episode 1: A Journey to Outsmart Blood Sugar (Before It Outsmarts Me)

Episode 2: When Fasting Met Blood Donation: An Accidental Experiment

Episode 3: When Numbers Tell Stories: My Annual Blood Report Meets Twice a Month Fasting

Episode 4: An Engineer’s Dilemma: Should I Debug My LDL or Just Take the Statin?

Episode 5: The Decision: When a CAC Score of 18 Stopped Being Just a Number

If you have already read them, you can skip the history and proceed directly to my latest experiment.

The Two Meal Experiment

If you have been following my attempt to outsmart blood sugar, you know that I have gradually turned my body into a small personal biochemical laboratory.

There are the muscle sponge experiments, where 20 squats or 30 push ups after a meal can bring my glucose down quite noticeably.

There are my 9 rounds of Sun Salutations every morning.

There are twice a month Ekadashi water fasts.

And somewhere along the way, in year 2026, something else became surprisingly natural.

I started eating two meals a day instead of three.

There was no grand strategy behind it. I simply discovered that I did not really miss the third meal.

My usual schedule had been roughly 9 AM for the first meal and 3 PM for the second and final meal.

The routine was simple.

The spreadsheet looked good.

My glucose numbers seemed happy.

So naturally, I assumed the system was working beautifully.

Then my kidneys filed a complaint.

The 2 AM Problem

I started waking up around 2 or 3 AM with an urgent message from the internal plumbing department.

Bathroom. Now.

There was no snooze button.

No negotiation.

Just a very clear biological command.

At first, I wondered whether this was simply another privilege that comes with getting older. Perhaps my bladder had decided that it too deserved a more active role in my life.

And then there was the obvious possibility that any man of my age is expected to consider:

The prostate.

I am not qualified to diagnose which department is misbehaving, so I am not going to promote myself from engineer to urologist overnight.

If my prostate is planning a rebellion, I will let my doctor investigate that during my regular physical rather than trying to diagnose it from my bedroom.

Until then, I decided to look at the evidence.

And the evidence produced an interesting clue.

One evening, instead of having my second meal at around 3 PM, I had a light meal at about 7:30 PM.

I even drank water until around 9 PM.

I fully expected my bladder to send me an even more enthusiastic invitation at 2 AM.

It didn't.

I slept through the night.

That got my attention.

One night is not a scientific study, of course. But it was enough to make me wonder whether the problem was not two meals a day itself, but perhaps the very early timing of my second meal.

What Could Be Going On?

This is where my curiosity kicked in.

If eating at 7:30 PM and drinking water until 9 PM did not result in a 2 AM bathroom visit, why was finishing my second meal around 3 PM apparently different?

There is a plausible physiological explanation, and it has less to do with the amount of water I drink than I initially thought.

When we eat, insulin rises. One of insulin's many jobs is to tell the kidneys to retain sodium. When we go for a longer period without food, insulin levels fall. With lower insulin, the kidneys can start excreting more sodium. This process is called natriuresis.

And here is the important part:

Water tends to follow sodium.

So when the kidneys decide to send more sodium out, they can send more water along with it. The result can be increased urine production.

There is another piece to the puzzle. Our body stores carbohydrate as glycogen in the liver and muscles, and glycogen is stored together with water. As the body uses some of that glycogen during the long gap between meals, some of the associated water is released and eventually needs to be excreted.

Normally, the body has another clever nighttime mechanism to prevent all this from turning into a midnight bathroom expedition. As we sleep, the hormone vasopressin, also known as antidiuretic hormone, rises and tells the kidneys to conserve water and produce less urine.

So, in simple terms, there are two competing instructions:

“We are sleeping. Save the water.”

versus

“There has been a long gap since the last meal. We can let some sodium and water go.”

I am obviously simplifying a much more complicated physiological system. But it helped me understand why my meal timing could potentially matter.

When my second and final meal was around 3 PM, there was a very long interval before bedtime and an even longer interval before breakfast the next morning. When I moved that meal to 7:30 PM for my little experiment, that interval became considerably shorter.

And despite eating later and drinking water until 9 PM, I slept through the night.

That does not prove that the earlier meal timing was causing my nighttime urination. There are many possible reasons someone might wake up to urinate, including prostate and bladder issues, fluid intake, medications, sleep patterns and other medical conditions.

I also did not measure my overnight urine volume, sodium excretion, insulin or vasopressin.

So I am not qualified to diagnose which department is misbehaving, and one experiment certainly does not qualify me to promote myself from engineer to urologist overnight.

But I did have something useful: a repeatable observation and a reasonable hypothesis.

Perhaps my two meal routine is perfectly fine, but the 3 PM timing of my second meal is not ideal for my sleep.

And that is enough for this engineer to run the next experiment.

The Next Experiment

That experiment has now given me an idea.

I am considering moving my two meals from my usual 9 AM and 3 PM schedule to something closer to:

First meal: around 11 AM

Second and final meal: around 6 to 7 PM

The 7:30 PM experiment was encouraging because I slept through the night despite eating later and drinking water later.

Now I want to see whether moving my regular meal timing in that direction will make a difference consistently.

I have not declared victory.

I have not even changed the system completely yet.

I am simply making the next adjustment and watching what happens.

And that outcome will have to wait for the next episode.

The Rest of the System Remains

Nothing else in the experiment needs to be thrown out.

The squats remain.

The push ups remain.

The Sun Salutations remain.

The two meal routine remains.

And the twice a month Ekadashi fast remains.

Only the timing of the two meals is now under review.

This is probably another example of something I have learned repeatedly during this journey.

The human body is not a spreadsheet.

You can optimize one variable and discover that another department has opinions.

I started by trying to improve blood sugar.

Then came cholesterol.

Then ApoB.

Then my CAC score of 18 reminded me that the cardiovascular system keeps its own historical records.

And now the kidneys have joined the conversation.

Apparently, they want a seat at the engineering review meeting too.

So the latest algorithm remains simple:

Measure. Observe. Adjust. Repeat.

I am not trying to make my body follow my spreadsheet.

I am trying to listen carefully enough to understand what the body is telling me.

And preferably, to understand it before 2 AM.

My system may be adjusting its timing before Daylight Saving Time, but the engineer still expects his quota of uninterrupted sleep.

Author's Note

These reflections come from an engineer who started learning human biology far too late in life, mostly out of curiosity and partly out of necessity. What began as an attempt to outsmart blood sugar has turned into a continuing experiment in metabolism, meal timing, data and resilience.

I am not a doctor, and this is not medical advice. Nighttime urination can have many causes, so persistent symptoms should be discussed with a healthcare professional.

Think of this as a personal midlife engineering project on the body's operating system, where trial, error and humility are all part of the lab work.