I have three DEXA scans on the same scanner at twelve-week intervals, fasted, same time of day.
This is a planning question. I know what my options are; I do not know how to weigh them.
What I want is the minimum viable version, which I suspect is smaller than what I would design.
What is the minimum version of this that is still defensible?
Six months is 182 days, which is past the point where the stores that mask a low intake have been drawn down — so yes, and the timing is the argument for it rather than an afterthought. The reason 182 days is the interesting number is that different stores empty on different clocks. Iron and folate deplete over weeks to a few months and will already show. B12 is stored in the liver on a scale of years, so a normal value at six months tells you about your liver rather than about your intake. Vitamin D moves with sun exposure and season more than with the diet in front of you. So draw the ones the interval can actually speak to: ferritin with a marker of inflammation beside it, folate, B12 knowing what it does and does not mean, magnesium accepting that serum sees about one per cent of the body pool, and vitamin D with the month written next to it. Ferritin is the one most often misread here. It rises with inflammation and falls with iron, and at 182 days of restricted intake both are plausible, which is exactly why it needs a CRP on the same requisition. A panel drawn now is also a baseline for month twelve, which is the second reason to do it. Nothing here is medical advice.
The relevant risk is that a very low intake sustained for months produces deficiencies that are slow to appear and slow to correct.
A sustained intake below about 1,200 kilocalories a day for women or 1,500 for men makes meeting micronutrient requirements from food difficult, which is the practical threshold at which supplementation stops being optional.
When volume is limited, energy density works in your favour for protein and fat and against you for vegetables — which is the reverse of standard advice and is worth stating explicitly.
Nutrient-deficiency patterns after bariatric surgery — a well-studied model of sustained low intake — identify iron, B12, calcium and vitamin D as the recurring gaps.
Set floors, not ceilings. Protein, fibre, fluid and a minimum energy intake.
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Browse resultsOn the detail: meal structure beats grazing when appetite is unreliable, because a missed meal cannot be recovered later in the day.
Nutrients that commonly fall short at low intakes are iron, calcium, vitamin D, vitamin B12, magnesium and folate. A basic multivitamin covers most of that gap cheaply and without needing a personalised protocol.
Fibre intake falls with total intake and with reduced plant-food volume, and constipation in this class is substantially a fibre and fluid problem before it is a motility one. Aim for 25 to 30 grams a day.
Weigh three days honestly. You will be surprised, in one direction or the other.
The short version: protein first, fibre second, micronutrients through food where possible and a plain multivitamin where not.
Three structured meals beat opportunistic grazing when appetite is unpredictable: a meal not eaten at the time is usually a meal not eaten at all.
Alcohol tolerance changes with reduced intake and slowed gastric emptying, which is a practical point people discover the hard way.
Fibre intake and stool frequency are directly related across intervention studies, and fibre plus fluid is first-line for functional constipation.
Energy density is an ally when volume is the constraint.
edited 20 Jun 2024 by coldpack_88 — reworded for clarity after a comment
On the detail: this is where a food diary earns its keep, because appetite suppression makes intake genuinely hard to estimate from memory.
A three-day weighed food record, done honestly once, is more informative than months of estimated tracking.
Micronutrient adequacy from food alone becomes difficult below roughly 1,200 to 1,500 kilocalories a day, which is why very-low-energy diets are formulated with supplementation.
The caveat is that supplementation beyond a basic multivitamin should follow a measured deficiency rather than a guess.
Structured meals beat grazing when appetite is unreliable.
Answer first: with appetite substantially suppressed, the risk shifts from eating too much to eating too little of specific things, and the planning problem changes accordingly.
Fluid intake often falls alongside food intake because much daily fluid arrives with meals, and mild dehydration then gets misattributed to the compound.
Self-reported intake is systematically underestimated, and appetite suppression makes it worse rather than better.
A basic multivitamin is cheap insurance when intake is genuinely low.
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