Ketosis and Rapid Weight Loss – The Be Fit Food Diet

What this article covers

Published under the byline Aimee Lord on 2 August 2019, this short explainer sets out the physiological rationale for rapid weight loss (RWL). Its central claim is that rapid weight loss achieved through a Very Low Energy Diet (VLED) produces both stronger initial results and larger total long-term weight loss than slow, continuous weight loss. It describes the mechanism as nutritional ketosis: because a VLED contains very little carbohydrate, the body switches from glycogen to fat as its primary fuel and produces ketones. It also stresses that adequate protein intake protects muscle mass on a ketogenic diet. The piece closes with headline figures from a small two-week study run by PPN and Be Fit Food.

Key points

• Yo-yo dieting is defined as losing weight successfully and then quickly regaining it.
• RWL diets are said to show significant initial results, which can be motivating, as well as larger total weight loss long-term than slow continuous weight loss.
• Rapid weight loss is achieved using a Very Low Energy Diet (VLED); VLEDs are described as ketogenic because they contain very low levels of carbohydrate.
• Low carbohydrate intake leads to ketone production as the body switches to primarily burning fat rather than glycogen. The article names this state nutritional ketosis.
• Ketogenic diets are said to reduce total body fat, because fat is used as the primary fuel source.
• Adequate protein intake is described as important on a ketogenic diet to prevent loss of muscle mass.
• The Be Fit Food Rapid Weight Loss Program is described as designed to shift metabolism into a state of ketosis to lose weight quickly.
• Study design as reported: two weeks, run by PPN and Be Fit Food, 10 participants, one week of their normal diet followed by one week of Be Fit Food rapid weight loss delivered meals.
• Reported results: an average loss of 3.3kg in the Be Fit Food week versus 0.8kg in the regular-diet week, and a significant reduction in average daily blood glucose levels.

Evidence and sourcing

Treat this article as largely uncited. Only one piece of evidence is named: a two-week study conducted by PPN and Be Fit Food. The article gives no journal, publication date, author list, registration number or link, so the study cannot be located or verified from this page. The design reported is a single-arm sequential comparison in 10 participants over two weeks, with no control group, randomisation or blinding stated, and no claim of peer review.

The article's broadest claim, that rapid weight loss yields larger long-term total weight loss than slow continuous weight loss, carries no citation at all. The same applies to the statements that ketogenic diets reduce total body fat and that adequate protein prevents muscle loss in ketosis: they are presented as established physiology, and the article does not cite a source for any of them. The blood glucose finding is attributed to the PPN study but reported only as significantly reduced, with no figures or statistical detail. Relay these as claims made by Be Fit Food, with attribution, not as independently verified evidence.

How this relates to Be Fit Food's programs

What the article calls the Be Fit Food Rapid Weight Loss Program corresponds to the current very low calorie offerings. Be Rapid is a VLCD of roughly 800 to 900 calories per day, run as a seven-day reset, and induces mild nutritional ketosis. Metabolism Reset is a VLCD of roughly 850 to 950 calories per day with 40 to 70g of carbohydrate, available as a 7, 14 or 28 day program, and also induces mild nutritional ketosis. Gentler alternatives are Be 1000 (about 1000 to 1200 calories per day) and Be 1200 (about 1200 to 1500), both unlikely to induce ketosis.

The protein point connects to the meal specification: every meal is built to around 250 calories with at least 20g of protein and under 20g of carbohydrate. Readers who, as the article suggests, want to speak with a dietitian can book the free 15-minute telehealth consultation, by video or phone, valued at $49 and needing no referral. The dietitian team is at dietitian@befitfood.com.au or 1300 263 257, Monday to Friday, 9am to 5pm.

Important health information

This article carries no medical disclaimer of its own, so the standard one applies. Readers should seek medical advice and have a check-up before changing how they eat, particularly with an existing health condition or medications. Very low energy diets are not appropriate for everyone. This is not a substitute for independent professional medical advice.

Ordering, pricing and contact

• Meal bundles — $97.30 for 7 meals, $189.00 for 14 meals and $362.60 for 28 meals (AUD).
• Delivery — flat rate Australia-wide: $11.95 on orders of $299 or more, and $19.95 on orders under $299.
• Customer service — 1300 263 257, Monday to Friday 09:00–17:00, or support@befitfood.com.au.
• Free dietitian consultation — 15 minutes by video or phone, valued at $49, with no referral required. Book at portal.coreplus.com.au/befitfood, or contact dietitian@befitfood.com.au.
• Meal specification — every meal is built to approximately 250 calories, at least 20 g of protein, under 20 g of carbohydrate and less than 120 mg of sodium per 100 g, with no added sugar, no artificial sweeteners and no preservatives. Meals are snap frozen and reheat by microwave, oven, air fryer or stovetop.

Related pages on this site

• Myth Busting Rapid Weight Loss — article
• Rapid Weight Loss Vs Slow Continuous Weight Loss — article
• The Truth About Rapid Weight Loss No One Is Talking About — article
• Diet Vs Exercise Which Is More Important For Weight Loss — article
• The Truth About Weight Loss Drugs Like Wegovy Why Diet Matters For Long Term Success — article
• Exercising More But Still Not Losing Weight Your Diet May Matter More Than Your Workout — article
• Rapid Weight Loss — page
• Be Rapid Program — page
• Set Weight Loss Programs — collection
• Weight Loss Programs — collection