Carb Timing and 2-Week Adjustments in Prep

Carb Timing and 2-Week Adjustments in Prep

Why the best nutrition coaches change less often, not more often, when digestion and water intake start moving the scale.

Justin Harris’s log from May 30, 2024 ties a big weight drop to constipation, distension, and slightly lower water intake over Memorial Day weekend; the mechanism he points to is simple fluid-and-bowel-content shift. That matters because it gives coaches a falsifiable rule: when scale weight, fullness, and abdominal look all move together after travel or water disruption, the first move should be a small, timed correction to digestion and intake consistency—not a rapid series of nutrition changes. The thesis is blunt: most bad prep adjustments come from reacting to short-term gut noise as if it were real tissue loss.

The problem with same-day nutrition tinkering

In prep, coaches often want to solve every visible problem immediately. The athlete looks flatter, so carbs go up. The stomach looks worse, so food goes down. The scale jumps, so sodium or water gets changed. The issue is not that those levers do nothing. It is that they are slow enough, and intertwined enough, that a sequence of fast changes makes it impossible to know what caused what.

The David LaMartina check-in is a good example of why timing matters. The coach notes a “big weight drop” alongside constipation and distension earlier than usual in prep, then connects part of the issue to travel and a day of slightly lower water intake. He does not treat the drop as a clean signal of improved condition. He treats it as a likely mix of leanness, dehydration drift, and backed-up digestion. That is the right order of thinking.

If a coach had immediately pushed a major carb increase, the next 24 to 72 hours would have been hard to interpret. Was the athlete fuller because the change worked, or because the gut finally cleared? Did the scale rebound from improved glycogen, from more food volume, or from returning water? Once the changes stack, the data stop being coaching data and start being noise.

Timing should follow the mechanism

The mechanism in these logs is not mysterious: less water, more gut slowdown, more distension. When the abdomen is the issue, the first question is whether the problem is content, not condition. That is why the smartest adjustments are often timed around digestion and hydration consistency before they are timed around calories.

This is especially true late in a prep, when the gut can become more sensitive and the athlete’s own perception gets louder. Harris’s note about a client being “super sensitive” to these swings is the practical warning. The tighter the prep, the more a small disturbance can look like a big body-composition change. A coach who adjusts too fast will end up chasing symptoms.

A better rule is simple: if the athlete recently traveled, drank less than usual, or changed routine, hold the big nutrition call until the body has had time to re-stabilize. Make one small adjustment, then wait for the next stable check-in. If the problem resolves, you learned something. If it does not, you still have a clean signal to work with.

Over-adjustment creates fake progress

The most dangerous thing about over-adjustment is that it can appear to work. A quick carb bump can make the athlete look better for a day. A food cut can make the scale fall fast. A water change can alter both fullness and abdominal appearance almost immediately. But immediate visible change is not the same as useful change.

The cost is decision quality. In physique coaching, every unnecessary adjustment narrows the experiment. If you change carbs, then water, then meal timing, then digestive aids, you have no way to know which variable mattered. The athlete may end up improving, but the coach will have learned very little. That makes the next prep harder, not easier.

Harris’s comment about constipation in prep also reflects a larger point: coaches need to distinguish structural trends from temporary dysfunction. The bigger the athlete gets, the more likely digestion becomes part of the outcome. That means the timeline of nutrition changes should respect the timeline of digestion. A coach is not trying to win the next meal. A coach is trying to land the next two weeks.

What to adjust first, and what to leave alone

When the issue is likely timing-related rather than tissue-related, the order of operations matters.

1. Stabilize routine first. If travel, lower water intake, or meal irregularity preceded the change, restore consistency before making broad calorie edits.
2. Make one change at a time. A small adjustment to food amount, meal spacing, or digestion support gives a cleaner read than three simultaneous changes.
3. Wait for the next stable check-in. Not the next meal, not the next workout, not the next mirror panic.
4. Only then decide on the bigger move. If the issue persists across a stable window, the coach has a real case for altering intake more meaningfully.

That sequence is slower than most people want, but it is faster in the only way that matters: it reduces the number of false positives.

AI coaching should be better at restraint than humans are

This is where AI coaching can be useful if it is used correctly. The value is not in instantly generating a dozen possible fixes. The value is in enforcing decision discipline. A good AI layer can flag that weight dropped after reduced water intake, that distension worsened before the usual point in prep, and that the athlete is in a high-sensitivity phase where a small mistake can look like a large one. Then it can recommend the smallest plausible correction first instead of amplifying the coach’s urge to micromanage.

That is a much better use of technology than pretending the model can outguess physiology in real time. The best systems do not make coaching more reactive. They make it more patient.

For coaches, the practical lesson is this: time nutrition changes to the body’s stable windows, not its noisy windows. When digestion, water, and travel are moving around, the right move is often to wait, normalize, and re-check before escalating. In prep, the biggest error is not under-reacting. It is over-reacting to a problem that would have clarified itself in 48 hours.

Bottom line

If the change happened right after travel, reduced water, or digestive slowdown, don’t stack major nutrition edits on top of it. Fix the timing first. Then judge the body once the noise settles. That is how you avoid turning one temporary gut issue into a week of bad coaching.

Sources Used

• raw/_consumed/2026-05-31/kahunas-export/2026-05-31-w19-24m/clients/david_lamartina___members-tlssnsjthkmnhfqcscszce25acz_vhdm_x2_xdlpx_i.json
• raw/_consumed/2026-05-26/troponin_supplements_kb.md
• raw/Justin_TT1.txt