# Supplements for Keeping the Downcycle Going

Status: draft complete

## Key takeaways

1. Psyllium and other viscous soluble fibers are the cleanest modest-helper category. The best case is slightly better satiety and adherence; the realistic effect size is small, and psyllium-specific weight-loss evidence is mixed.
2. Protein supplements and meal replacements can be useful, but mostly because they simplify a high-protein, lower-calorie diet. They are structured adherence tools, not magic fat burners.
3. Green tea extract and caffeine have a real but small signal. Any benefit is usually marginal enough that sleep disruption, stimulant tolerance, or side-effect risk can erase the upside.
4. Glucomannan is weaker than psyllium and comes with enough swallowing or obstruction baggage that it should not rank as a default recommendation.
5. Berberine is overhyped relative to the evidence. Some short-term human studies show modest weight or waist reductions, but the effect is nowhere near medication territory.
6. Chromium, garcinia cambogia, CLA-style fat burners, and similar products mostly belong in the low-value hype bucket.

## Practical ranking

### Best-supported modest helpers

1. **Psyllium / viscous soluble fiber**
   - Best use: pre-meal satiety, helping higher-volume meals feel more filling, filling a low-fiber diet gap.
   - Expected effect size: small. Conservative pooled estimates for viscous fiber are around a few tenths of a kilogram over about 10 weeks; broader soluble-fiber reviews are more favorable but heterogeneous.
   - Main downside: bloating/fullness, and it needs water plus tolerability.

2. **Protein supplements / meal replacements**
   - Best use: preserving lean mass, reducing decision fatigue, and making calorie targets easier to hit.
   - Expected effect size: indirect. Better body composition and adherence rather than a supplement-specific weight-loss effect.
   - Main downside: easy to overconsume if they become extra calories instead of replacing food.

3. **Green tea extract / caffeine**
   - Best use: mild short-term appetite or energy support.
   - Expected effect size: usually about 1 kg or less on top of background dieting, often not clinically important.
   - Main downside: tolerance, sleep disruption, anxiety, blood-pressure effects; green tea extract also needs a liver-safety caveat.

### Lower-confidence / second-tier

4. **Glucomannan**
   - Mechanistically plausible, but less convincing than psyllium and less attractive from a safety/usability standpoint.

5. **Berberine**
   - Some signal for modest weight or waist reduction, especially in metabolically unhealthy populations, but too overmarketed for the actual effect size.

### Low-value hype

6. **Chromium, garcinia cambogia, CLA, and most branded fat-burner blends**
   - Best summary: small, inconsistent, unimpressive, or not worth the noise, risk, and marketing.

## Scope checklist

- [x] Start with psyllium / soluble fiber and other best-supported options
- [x] Gather pooled effects where available
- [x] Separate modest helpers from hype
- [x] Document side effects, tolerability, and contraindications
- [x] Rank by usefulness for sustaining a calorie deficit

## Effect-size notes

- **Soluble fiber / psyllium:** broad soluble-fiber meta-analyses support modest reductions in body weight and waist circumference. Conservative pooled estimates for viscous fiber are only a few tenths of a kilogram over roughly 10 weeks, and one psyllium-specific meta-analysis found no significant effect, so psyllium is credible as a satiety aid, not a major lever.
- **Protein / meal replacements:** the better evidence is on adherence and body composition, especially lean-mass preservation during an energy deficit, rather than on large extra total weight loss.
- **Green tea extract / caffeine:** the pooled effect appears small. The 2024 green-tea meta-analysis found statistically significant improvements in body-mass-related outcomes, but Cochrane-style framing remains the right practical interpretation: small and probably not clinically important for most people.
- **Berberine:** pooled effects are generally around 1 to 2 kg and small waist/BMI improvements in short-duration trials, often in people with metabolic disease. That is a modest helper at best, not an OTC Ozempic.

## Framing for the wiki

- Lead with: `A few supplements can help at the margins, mostly by improving satiety or diet structure. None of them substitute for the calorie deficit itself.`
- Strongest mention: `psyllium / viscous soluble fiber`, `protein shakes / structured meal replacements`.
- Mention cautiously: `green tea extract`, `caffeine`, `berberine`.
- Put in hype bin: `chromium`, `garcinia cambogia`, `CLA`, and generic stimulant-heavy fat-burner stacks.