Why the diet works for everyone except you.
Inositol for weight: The studies
Weight is metabolic before it's behavioural. When cells respond poorly to insulin, the body stores more and burns less — and blood sugar crashes drive hunger. The evidence below is a chain with two links: dips make you eat more, and inositol supports how your body handles glucose and insulin.*
Study 1 — Blood sugar dips make you hungry
The Study
1,070 people wore blood sugar monitors while eating over 71,000 real meals. The finding: it's not the sugar spike after a meal that makes you hungry — it's the crash that follows 2–3 hours later. The bigger the crash, the hungrier people got, the sooner they ate again, and the more they ate over the whole next day (Wyatt et al., 2021, Nature Metabolism).¹
Study Attributes
Continuous Glucose Monitors
Everyone wore a continuous glucose monitor — a small sensor that tracks blood sugar around the clock — so researchers saw real responses to real meals, not lab questionnaires. Two separate groups (UK and US) showed the same pattern.
Who Was Studied
This study was in healthy adults, not specifically women with PCOS. It maps how blood sugar crashes drive hunger in everyone.
Study 2 — Inositol supports insulin & glucose handling
The Evidence
So if crashes drive hunger, what steadies them? In the trials on this site, inositol consistently improved how the body handles insulin: fasting insulin roughly halved over six months on the 40:1 blend (Benelli, 2016²), and in a separate trial, insulin measured after meals improved within three months (Nordio, 2019³) — exactly the window where the hunger-driving crash happens.*
The Numbers
Fasting Insulin, −47%
Fasting insulin — the insulin in your blood after an overnight fast — roughly halved over the six months (20.19 → 10.74 μU/mL). The placebo group didn't change.*
Post-Meal Insulin
In a trial comparing seven inositol blends, insulin measured after meals improved significantly within three months (Nordio, 2019). After meals is exactly the 2–3 hour window where the hunger-driving crashes happen.*
HOMA Index, −42%
HOMA is a standard score doctors use to estimate insulin resistance from a simple blood test. Lower is better. It fell 42% on average (3.38 → 1.97) — and didn't budge on placebo.*
Study 3 — Fat down, muscle kept
Study Background
A precise question: does adding inositol to a diet change what kind of weight you lose? 43 women with PCOS followed the same calorie-controlled diet for six months — one group diet only, one with myo-inositol added, one with the 40:1 blend added (Le Donne et al., 2019).⁴
Study Attributes
Three Groups, Same Diet
Group 1: diet alone. Group 2: the same diet plus 4 g myo-inositol a day. Group 3: the same diet plus the 40:1 myo + D-chiro blend. Everyone ate the same way — so any difference between groups comes from the inositol.
Randomized
Who got which was decided by chance, like a coin flip. That keeps the groups fair to compare.
The 40:1 Ratio
Your blood naturally holds about 40 parts myo-inositol to 1 part D-chiro-inositol — the same balance used in Bodology. Group 3 took 1.1 g myo + 27.6 mg D-chiro daily.
Why the kind of weight matters
MYO + D-CHIRO 40:1
+35%
more fat loss with the 40:1 blend + diet than with diet alone (−18.9% vs −14% fat mass over 6 months)*⁴
muscle gained with diet + myo-inositol — while the diet-only group lost 6.2% of theirs*⁴
of the 40:1 group had regular cycles again by 6 months (75% started irregular)*⁴
Why Lean Mass Matters
Muscle burns energy even when you're doing nothing, and it's where most of your blood sugar gets used. Lose muscle while dieting and your body burns less all day — which is how weight creeps back. Keep it, and the loss is easier to hold.
Fat Mass vs. Weight
The scale weighs everything — fat, muscle, water. Fat mass is just the fat part. Two people can lose the same weight and end up in very different places depending on how much of it was fat versus muscle.
A note on GLP-1 medications
What the research shows
GLP-1 medications (like semaglutide) produce big weight loss — but studies report that in some trials, 40–60% of the weight lost is muscle, not fat.⁵ And within a year of stopping, people regained about two-thirds of what they lost.⁶ Inositol is not a GLP-1 and its effects are far smaller — but in the trial above, the fat loss came with muscle kept or gained. Different tools for different jobs; talk to your doctor about what's right for you.
The Numbers
Lean Mass Loss on GLP-1s
In some GLP-1 trials, 40–60% of the total weight lost was lean mass — which includes muscle, the tissue that keeps your metabolism up. Other studies report around 15% or less (Neeland et al., 2024, Diabetes, Obesity and Metabolism).⁵
Weight Regain After Stopping
In the STEP 1 follow-up, people lost an average 17.3% of their body weight on semaglutide — then regained roughly two-thirds of it within a year of stopping (Wilding et al., 2022).⁶
Study 4 — BMI down across 15 trials
Study Background
Zoom out. A review pooled 15 separate trials of inositol. Overall, BMI came down significantly versus control — with the strongest effect in women with PCOS and people carrying extra weight, and myo-inositol the strongest type (Zarezadeh et al., 2022).⁷*
Study Attributes
What a Meta-Analysis Is
A meta-analysis pools many separate trials into one answer, so no single study's quirks can skew the picture. It's the strongest kind of evidence for an overall effect.
The Pooled Result
Across the 15 trials, BMI fell by 0.41 kg/m² on average versus control (95% CI −0.78 to −0.04). Modest, real, and consistent with the body-composition results above.*
¹ Wyatt P, Berry SE, et al. Postprandial glycaemic dips predict appetite and energy intake in healthy individuals. Nat Metab. 2021;3(4):523–529. DOI: 10.1038/s42255-021-00383-x. Healthy adults, not a PCOS population; an observational finding about hunger, not an inositol study. Correlations: hunger at 2–3 h r = 0.16; time to next meal r = −0.14; calories at 3–4 h r = 0.19; calories over 24 h r = 0.27; all p < 0.001.
² Benelli E, et al. Int J Endocrinol. 2016;2016:3204083. DOI: 10.1155/2016/3204083.
³ Nordio M, Basciani S, Camajani E. Eur Rev Med Pharmacol Sci. 2019;23(12):5512–5521. DOI: 10.26355/eurrev_201906_18223.
⁴ Le Donne M, Metro D, Alibrandi A, Papa M, Benvenga S. Effects of three treatment modalities (diet, myoinositol or myoinositol associated with D-chiro-inositol) on clinical and body composition outcomes in women with polycystic ovary syndrome. Eur Rev Med Pharmacol Sci. 2019;23(5):2293–2301. DOI: 10.26355/eurrev_201903_17278. Group averages; "35% more fat loss" is the relative difference between the −18.9% and −14% fat-mass reductions. Small groups; independent study, not of Bodology; supplement amounts differ from Bodology's serving.
⁵ Neeland IJ, Linge J, Birkenfeld AL. Diabetes Obes Metab. 2024;26(Suppl 4):16–27. DOI: 10.1111/dom.15728.
⁶ Wilding JPH, et al. Weight regain and cardiometabolic effects after withdrawal of semaglutide: the STEP 1 trial extension. Diabetes Obes Metab. 2022;24(8):1553–1564. DOI: 10.1111/dom.14725.
⁷ Zarezadeh M, et al. Inositol supplementation and body mass index: a systematic review and meta-analysis of randomized clinical trials. Obes Sci Pract. 2022;8(3):387–397. DOI: 10.1002/osp4.569.
⁸ Delavar MA, Mirabi P, Rosenkranz SK, Alibabaei-Omran F, Ahmadi N, Ghorbani Z. Inositol supplementation efficacy in improving key cardiometabolic and anthropometric indices: a GRADE-assessed systematic review and meta-analysis of randomized controlled trials. Diabetol Metab Syndr. 2025;17(1):411. DOI: 10.1186/s13098-025-01980-6. The authors rate the body-measurement evidence as low certainty with high between-trial variation.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Inositol is a dietary supplement, not a weight-loss drug, and works best alongside diet and exercise.
