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Brand owned by Nestlé (Switzerland) · about the brand
Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack
Decode Label Safety Score
How we got 6.0 ShowHide
Reviewed 4 times · Methodology v3.1 (updated 8 Oct 2026) — what changed
This adult weight-management meal replacement provides a balanced macronutrient profile with added fiber and a full spectrum of vitamins and minerals, making it suitable for its intended use under medical or dietary supervision. The primary concerns are the presence of partially hydrogenated guar gum, which is a modified (interesterified or hydrogenated) vegetable fat that does not yield a measurable amount in this product — the nutrition panel declares 0 g, though this fat class remains under research, and the use of nature-identical flavoring substances and sweeteners, which contribute to its ultra-processed nature. Individuals monitoring their intake of trans fats or preferring whole-food ingredients should be aware of these aspects.
At a glance
From the declared label — not a lab testFindings to weigh
What’s favorable
- Whey Protein Concentrate
- Caseinates (milk protein)
- Low erucic rapeseed oil
- Isomaltulose
- Fibre (Gum arabic)
- +4 more →
Adult meal replacement with trans fats, artificial sweeteners, and flavorings.
This meal replacement is designed for adults under dietary supervision, offering protein, carbohydrates, fiber, and micronutrients. However, it contains partially hydrogenated guar gum, a modified (interesterified or hydrogenated) vegetable fat that does not yield a measurable amount in this product — the nutrition panel declares 0 g, though this fat class remains under research, which are linked to cardiovascular health concerns. It also uses nature-identical flavorings and sweeteners, indicating a highly processed formulation.
Declared allergens: Milk and Soy
Relevant if you have any of these allergies or intolerances.
Based on the declared ingredient list. This is a risk only to people with the allergy, not a general-population safety issue, so it does not lower the safety score.
Concern breakdown
Score out of 10 · higher = fewer concernsHow this product performs on each concern we check for supplement. This is a breakdown of the same evidence behind the score above — not a separate verdict.
Saturated fat 2.1 g · trans fat 0.1 g per 100 g/ml
1 concern could not be assessed from this label. That means we don't know — not that there's nothing to find.
Other audiences
AvoidThis is a weight-management meal replacement (Food for Special Dietary Use), formulated for adults. It is not intended for infants or children, and the pack directs that it be used under medical or dietary supervision.
Why the score is capped
Contains an intense artificial sweetener (named by INS code). Sweeteners are judged by name, and a protein powder is not exempt
Rule S-CAP-01 · Source: Declared ingredient list; EFSA and JECFA acceptable-daily-intake reviews of the named sweetener
What's good
High-quality protein sources (whey and casein)
Contains dietary fiber (gum arabic)
Fortified with essential vitamins and minerals
Includes healthy fats (low erucic rapeseed oil, high oleic sunflower oil)
Isomaltulose provides sustained energy release
Watch out for
Contains partially hydrolyzed guar gum, a modified fat
Uses nature-identical flavorings
Contains common allergens: milk and soy
Decode Label Analysis
The product contains 'Partially hydrolyzed guar gum', which is a modified fat. While the nutrition panel declares 0g trans fat, some modified fats can be a source of industrial trans fats, which are linked to increased risk of cardiovascular disease. Consumers should be aware of the type of fats used.
Individuals sensitive to artificial additives may wish to exercise caution.
Contains milk proteins (Whey Protein Concentrate, Caseinates, Milk Solids) and Soya lecithin, which are common allergens. Individuals with milk or soy allergies should avoid this product.
Claim check
Front-of-pack marketing claims checked against this product's actual ingredients and nutrition. "Can't verify" means the label does not provide enough information to check the claim — it is not the same as the claim being false.
The claim 'Scientifically Designed' is a marketing statement that cannot be verified from the provided ingredient list or nutrition facts.
The claim '60% LESS CALORIES' is a comparative claim that requires a reference product for verification, which is not provided on the label.
The claim 'SUPPORTS WEIGHT MANAGEMENT' is a functional claim that cannot be verified from the provided ingredient list or nutrition facts alone.
This is the product’s regulatory food-category / usage designation (e.g. a Food for Special Dietary Use classification or a mandated “use under medical advice” direction) — printed because regulation requires it, not a benefit claim. An ingredient list can’t confirm or deny it, s
This is the product’s regulatory food-category / usage designation (e.g. a Food for Special Dietary Use classification or a mandated “use under medical advice” direction) — printed because regulation requires it, not a benefit claim. An ingredient list can’t confirm or deny it, s
This is the product’s regulatory food-category / usage designation (e.g. a Food for Special Dietary Use classification or a mandated “use under medical advice” direction) — printed because regulation requires it, not a benefit claim. An ingredient list can’t confirm or deny it, s
This is a functional claim related to weight control and management that cannot be verified from the provided ingredient list or nutrition facts alone.
This is the product’s regulatory food-category / usage designation (e.g. a Food for Special Dietary Use classification or a mandated “use under medical advice” direction) — printed because regulation requires it, not a benefit claim. An ingredient list can’t confirm or deny it, s
The ingredients list 'Cocoa Solids' and 'Nature identical (chocolate) flavouring substances', supporting the chocolate flavor.
Protein provides 38% of this product’s energy, meeting the 20% a “high protein” claim requires. (Protein claims are set on % of energy, not % by weight.)
The product contains 6g of fiber per 100g, which is a good source of dietary fiber.
The nutrition information lists 13 vitamins and 12 minerals, totaling 25.
Read straight from the back-of-pack photo — quantities, sections and any disguised terms, so the small print can’t hide behind the marketing.
-
1.
Whey protein concentrate
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2.
Caseinates (milk protein)
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3.
Milk solids
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4.
Maltodextrin
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5.
Low erucic rapeseed oil
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6.
Dried glucose syrup
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7.
Isomaltulose
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8.
Partially hydrolyzed guar gum (Guar gum derivative)
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9.
Fibre (Gum arabic)
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10.
Cocoa solids 3%Cocoa solids (3%)
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11.
Minerals
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12.
High oleic sunflower oil
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13.
Nature identical (chocolate) flavouring substances
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14.
Iodized salt
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15.
Emulsifier (Soya lecithin)
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16.
Vitamins
-
17.
SweetenersAcesulfame potassium (INS 950), Steviol glycosides (INS 960)Sweeteners (950 & 960)
In label order — normally largest quantity first. Select a row for the full write-up and sources.
These are major food allergens named on the ingredient list. They are a risk only to people allergic to them — not a general-population safety issue — so they do not lower the safety score. Anyone with the allergy should avoid this product, and check the pack’s own allergen statement.
✓ Decode Label Assessment: Favorable ⚠ Decode Label Assessment: Concern Decode Label Assessment: Neutral
Who should take caution
About this ingredient
No detailed safety data in our database yet for this ingredient.
Learn More
| Energy | 400 kcal |
| Protein | 38 g |
| Carbohydrate | 40.6 g |
| Total Sugars | 12 g |
| Added Sugars | 1.3 g |
| Total Fat | 11 g |
| Saturated Fat | 2.1 g |
| Trans Fat | 0.06 g |
| Dietary Fibre | 6 g |
| Sodium | 250 mg |
Colour shows the per-100g level (green = low, amber = moderate, red = high), from the product's label.
Compare with other meal replacement products
Assessed using the same Decode Label methodology, sorted by score. Each score reflects the information available for that product at the time of assessment.
Side-by-side comparisons
How this product's label compares with others on the same shelf, row by row.
- VS Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack vs Lipton Metabolism Boost with 150mg Green Tea Catechins and 50mg ACV
- VS Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack vs Nestlé Optifast Weight Management Shake
- VS Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack vs Optifast Weight Management Shake
What are the ingredients in Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack?
The label of Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack lists 17 ingredients, in label order: Whey Protein Concentrate, Caseinates (milk protein), Milk Solids, Maltodextrin, Low erucic rapeseed oil, Dried Glucose Syrup, Isomaltulose, Partially hydrolyzed guar gum (Guar gum derivative), Fibre (Gum arabic), Cocoa Solids, Minerals, High oleic sunflower oil, Nature identical (chocolate) flavouring substances, Iodized Salt, Emulsifier (Soya lecithin), Vitamins, Sweeteners. Flagged by the analysis: Partially hydrolyzed guar gum (Guar gum derivative), Nature identical (chocolate) flavouring substances, Sweeteners.
Is Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack safe to eat?
Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack scores 6.0/10 on Decode Label (Moderate). This meal replacement is designed for adults under dietary supervision, offering protein, carbohydrates, fiber, and micronutrients. However, it contains partially hydrogenated guar gum, a modified (interesterified or hydrogenated) vegetable fat that does not yield a measurable amount in this product — the nutrition panel declares 0 g, though this fat class remains under research, which are linked to cardiovascular health concerns. It also uses nature-identical flavorings and sweeteners, indicating a highly processed formulation.
Why does Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack score 6.0/10?
What the analysis notes: Contains partially hydrolyzed guar gum, a modified fat. Uses nature-identical flavorings. Contains common allergens: milk and soy.
Who should avoid Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack?
The points the analysis notes are most relevant to: Cardiovascular concerns; Trans fat avoidance; Sensitivity to artificial sweeteners; Milk allergy / lactose intolerance; Soy allergy.
Does Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack contain allergens?
Yes — the ingredient list contains milk (Whey Protein Concentrate, Caseinates (milk protein) and Milk Solids) and soy (Emulsifier (Soya lecithin)). Check the allergen statement on the pack too if you have a diagnosed allergy.
Does Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack contain milk?
Yes — the ingredient list names Whey Protein Concentrate, Caseinates (milk protein) and Milk Solids. People with milk allergy / lactose intolerance should treat it as containing milk, and check the allergen statement on the pack too.
Does Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack contain soy?
Yes — the ingredient list names Emulsifier (Soya lecithin). People with soy allergy should treat it as containing soy, and check the allergen statement on the pack too.
How much sugar is in Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack?
12 g of total sugar per 100 g. The label declares 1.3 g of that as added sugar per 100 g.
Are the claims on the Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack pack accurate?
Decode Label checked 12 claims against the ingredient list and nutrition panel. "Nestlé Optifast Scientifically Designed Weight Loss Diet" — can't be verified from the label. "60% LESS CALORIES" — can't be verified from the label. "SUPPORTS WEIGHT MANAGEMENT" — can't be verified from the label.
Is Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack vegetarian?
Nestlé Optifast Scientifically Designed Weight Loss Diet, 400g Pet Jar Pack is marked vegetarian.
Answers are generated from this product's own Decode Label analysis — the score, the ingredient list and the label claims shown above. Always check the pack itself for allergen and dietary information.
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About this analysis: Based on declared label information and available evidence. Decode Label does not independently laboratory-test products, and a score is not a regulatory determination or medical advice.
Disclaimer: Safety scores are Decode Label-generated assessments based on publicly available regulatory data (FSSAI, WHO, EFSA, IARC) and peer-reviewed research. They are not a substitute for professional medical advice, and they are not a regulatory determination, a laboratory safety certification or a medical diagnosis. Ingredient safety can vary by individual health conditions, concentration, and usage context. Decode Label is an independent information service and scores every brand by the same rules. No brand pays for or influences its score. Our founder also founded the personal-care brand Botani Bestie (see our story); its products are scored exactly like everyone else's. Data limitations: This assessment is based on the information declared on the product label and the evidence sources above — Decode Label does not independently laboratory-test this product. Ingredient concentrations, sourcing and manufacturing can vary between batches and are not always disclosed. A finding that is not shown here means it was not identified from the available label information, not that it has been ruled out.
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