Peanut Butter on Keto: Yes If It’s the Right One

The ketogenic diet requires careful attention to carbohydrate content in every food choice. Peanut butter, a staple in many British households, can work within keto macros—but only if you select the correct variety.

Why Peanut Butter Is Problematic

Standard supermarket peanut butters often contain added sugars or hydrogenated vegetable oils. A 15g serving of a typical brand like Sun-Pat Smooth contains 3.2g of carbs, half from added sugar. Even “crunchy” variants may use maltodextrin as a stabiliser, spiking blood glucose.

What to Look For

A keto-compliant peanut butter should have:

• Ingredients: Only peanuts (and optionally salt)
• Carbs: Under 4g per 100g
• Oils: No palm oil or hydrogenated fats

Tesco’s 100% Peanut Butter (£1.80 for 340g) meets these criteria, with 3.8g carbs per 100g. The oil separation you see in the jar is normal—just stir before use.

Nutritional Breakdown

Per 15g serving of natural peanut butter:

• Energy: 90kcal
• Fat: 7.5g
• Protein: 3.5g
• Carbs: 0.6g net (after subtracting 1g fibre)

This makes it a high-fat, moderate-protein snack that fits keto macro calculations. Pair with celery or use in keto fat bomb recipes for balanced nutrition.

What This Means in Practice

During darker winter months when fresh berries are expensive, peanut butter provides an affordable shelf-stable fat source. Budget around £4 monthly if using 1-2 servings weekly. Always measure portions—peanut butter is calorie-dense, and overconsumption may stall weight loss.

Frequently Asked Questions

Can I eat peanut butter every day on keto?

In moderation. Stick to 15-30g daily to avoid exceeding carb limits. Rotate with other nut butters like almond for nutritional variety.

Is powdered peanut butter keto-friendly?

Some are. Check labels—many add maltodextrin. PB2 Original has 5g net carbs per 12g serving, requiring careful portion control.

Why does natural peanut butter separate?

The oils rise naturally without emulsifiers. Stirring reintegrates it. Store upside down for easier mixing.

The Bottom Line

Natural peanut butter without additives can be part of a ketogenic diet when consumed in controlled portions. Its versatility makes it useful for both sweet and savoury applications. If you’d rather not do the macro maths yourself, the Keto Dieting app does it for you on Google Play and the App Store.

References

1. Bueno NB, de Melo IS, de Oliveira SL, da Rocha Ataide T (2013). Very-low-carbohydrate ketogenic diet v. low-fat diet for long-term weight loss: a meta-analysis of randomised controlled trials. British Journal of Nutrition. https://doi.org/10.1017/S0007114513000548
2. Sumithran P, Prendergast LA, Delbridge E, et al. (2013). Ketosis and appetite-mediating nutrients and hormones after weight loss. European Journal of Clinical Nutrition. https://doi.org/10.1038/ejcn.2013.90