Is 10 lb in a week real fat loss?

Almost entirely water, glycogen, and gut content. Actual fat loss is ~1-2 lb at most.

Cabbage Soup Diet: An Honest Audit (2026)

What it claims

A 7-day plan with unlimited cabbage soup as the base, plus a rotating daily allowance (e.g., Day 1: fruit only; Day 2: vegetables; Day 3: fruit and vegetables; etc.). Promises 10 lb loss in a week.

The mechanism

Severe calorie restriction (~800-1000 kcal/day) produces rapid water and glycogen loss. The 'cabbage soup' branding is marketing — any 800-kcal monotonous diet would produce similar weight loss.

What the research actually shows

No RCTs. Standard severe-CR caveats apply: muscle loss, metabolic adaptation, full regain after.¹²

Who it works for

No one for sustainable results.

Who it fails

Everyone seeking sustained loss.

The honest verdict

Quintessential fad diet. The weight comes off, the weight comes back. No mechanism, no evidence base, real metabolic and muscle-loss costs. Avoid.

What to do instead

Anything sustainable. Mediterranean. Whole-food eating. Resistance training.

Common misconceptions

Is 10 lb in a week real fat loss?: Almost entirely water, glycogen, and gut content. Actual fat loss is ~1-2 lb at most.

References

1.Fothergill E et al. (2016). Persistent metabolic adaptation 6 years after 'The Biggest Loser' competition. Obesity. PubMed 27136388
2.Rosenbaum M, Leibel RL (2010). Adaptive thermogenesis in humans. International Journal of Obesity. PubMed 20840326