The following supplements are used for “weight loss” EXCEPT:

Question

BlackTom AI · Accepted Answer

Brewer’s yeast is primarily a nutritional supplement (rich in protein and B vitamins) and is not typically promoted as a weight‑loss agent, so it is the exception.

Relevant knowledge points and concepts:
- Many botanical extracts, nutrients, and metabolic intermediates are marketed for weight loss because they may alter appetite, satiety, or energy metabolism. Examples include soluble fiber (promotes satiety), pyruvate (a metabolic intermediate claimed to increase fat oxidation), banaba leaf (contains corosolic acid with effects on glucose metabolism), and flavonoids such as quercetin (included in some formulations for metabolic/inflammatory modulation).
- Brewer’s yeast is mainly used as a dietary source of B vitamins, protein, and sometimes chromium; clinical uses focus on nutritional supplementation rather than primary weight‑loss therapy.

Step-by-step reasoning through the choices:
- e. Pyruvate: Sodium pyruvate has been sold as a weight‑loss supplement. Some small trials reported modest reductions in body weight/fat with high doses; thus it is commonly listed among fat‑loss supplements.
- a. Banaba leaf: Banaba (Lagerstroemia speciosa) contains corosolic acid, used traditionally and in supplements to improve glycemic control and is marketed for weight and fat management because improved glucose handling can support weight control.
- b. Fiber: Soluble fiber supplements (psyllium, glucomannan, etc.) are well established as weight‑loss aids by increasing satiety, reducing caloric intake, and slowing gastric emptying.
- d. Quercetin (spelled here as “quercitin”): A flavonoid included in some weight‑loss formulations for its antioxidant/anti‑inflammatory effects and potential influence on adipocyte biology; marketed in metabolic support products.
- c. Brewer’s yeasts: While brewer’s yeast can contain chromium and be used to support nutrition or glucose metabolism, it is not generally used or marketed primarily for weight loss. Its role is nutritional supplementation rather than a fat‑loss agent.

Why the correct answer is correct:
Brewer’s yeast does not belong to the typical list of supplements used specifically for weight reduction; the other four items are commonly promoted for weight‑loss or metabolic support.

Briefly why the other options are incorrect:
Pyruvate, banaba leaf, fiber, and quercetin are all used or marketed with weight‑loss claims or metabolic effects that support weight management.

Conclusion:
Therefore the correct choice is c. brewer’s yeasts, which matches the provided answer.

The following supplements are used for “weight loss” EXCEPT:单项选择题

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