📊 Full nutrition facts — per 100g
| Nutrient | Amount | % Daily value | Level |
|---|---|---|---|
| Calories | 562 kcal | 28% | |
| Carbohydrates | 27.5g | 9% | |
| Dietary fibre | 10.3g | 37% | |
| Sugars | 7.7g | — | |
| GI (Glycaemic Index) | ~15 — Low | — | |
| Protein | 20.2g | 40% | |
| Vitamin B6 | 1.7mg | 107% | |
| Thiamine (B1) | 0.87mg | 58% | |
| Manganese | 1.2mg | 62% | |
| Copper | 1.3mg | 65% | |
| Phosphorus | 490mg | 49% | |
| Lutein+Zeaxanthin | 1405µg | — |
Based on Australian NRV. Source: FSANZ Australian Food Composition Database.
📈 Glycaemic index (GI)
💊 Key vitamins & minerals
✅ Health benefits
Pistachios are uniquely the only tree nut providing significant quantities of lutein and zeaxanthin — the carotenoids that accumulate in the retinal macula and protect against age-related macular degeneration (AMD) and cataracts. At 1405µg per 100g, pistachios provide comparable lutein+zeaxanthin to many vegetables. Combined with the skin's anthocyanins, pistachios provide multi-pathway eye antioxidant protection.
Beyond their own negligible GI, pistachios actively reduce the blood glucose response to other foods eaten at the same time. Clinical trials have shown that eating pistachios alongside white bread reduces the post-meal glucose spike by up to 30% — due to their fat, protein and fibre slowing gastric emptying and starch digestion. This 'second meal effect' extends to subsequent meals.
A meta-analysis of 11 clinical trials found pistachio consumption significantly reduced total cholesterol, LDL cholesterol, triglycerides and blood pressure. Pistachios are uniquely among nuts in containing resveratrol (also found in red wine) — a polyphenol with vasodilatory and anti-inflammatory properties. The American Heart Association includes pistachios among recommended heart-healthy foods.
Pistachios provide 20.2g of protein per 100g with a relatively complete amino acid profile — including all essential amino acids. Clinical trials have shown that including pistachios as a regular snack improves body composition markers — reducing BMI, waist circumference and visceral fat — without increasing total caloric intake, likely due to the high satiety value and partial caloric inaccessibility of nut fat.
⚠️ Who should limit or avoid
Pistachio allergy is one of the most common tree nut allergies and can cause anaphylaxis. Pistachios are strongly cross-reactive with cashew nuts — approximately 50% of people with cashew allergy are also allergic to pistachios (and vice versa). This is because both belong to the Anacardiaceae family. People with known cashew allergy should approach pistachios with extreme caution and allergist guidance.
Pistachios are high in fructans (a FODMAP) and are among the foods most likely to trigger IBS symptoms in sensitive individuals. A standard serving of 28g (about 49 kernels) is moderate-FODMAP — test individual tolerance starting with 10 kernels. People with diagnosed IBS should seek dietitian guidance on pistachio serving size.
Pistachios in-shell naturally slow eating pace (you have to open each one) — research at Cornell University showed that people ate 41% fewer calories when eating in-shell pistachios versus pre-shelled. Pre-shelled pistachios are much easier to overconsume. Keep the shells as a visual reminder of quantity consumed.
🛒 How to select & buy pistachios
In-shell pistachios slow eating naturally and research shows people eat fewer calories when shelling as they go — plus the shells serve as a visual cue of how many you've eaten. For cooking and baking, pre-shelled kernels are more convenient. For snacking, in-shell is the better nutritional choice beyond just taste.
A pistachio with a naturally split shell indicates the kernel matured fully before harvest — this is the desired quality indicator. Closed shells mean the nut was either harvested immature or is a poor variety. Good quality pistachio products should have a high percentage of naturally split shells. Forced-open shells (cracked mechanically) are a lower grade product.
Natural pistachio kernels are greenish (from chlorophyll) or pale cream (for the more mature kernels). The vivid green colour of pistachios in some products, particularly older American products, was sometimes enhanced with artificial dye — this practice is rare now. Look for pistachios with natural colour variation rather than uniform bright green.
🧊 Storage tips & shelf life
In-shell pistachios store well at room temperature in a sealed container. Shelled pistachios go rancid more quickly without the protective shell. In warm Australian conditions, refrigerate shelled pistachios after the first month.
Ideal for both in-shell and shelled pistachios. Refrigeration dramatically extends freshness and prevents oxidation of the delicate oils. Bring to room temperature before eating for the best flavour — cold pistachios have reduced aromatic complexity.
Excellent for long-term storage and bulk buying. Pistachios freeze without quality loss. Thaw at room temperature for 15 minutes or add directly to cooking from frozen. Buying 1kg bags from Iranian food importers and freezing portions is the most economical approach.
📖 About pistachios — complete guide
Pistachios have one of the longest relationships with human cuisine of any nut — evidence of pistachio consumption dates to 780,000 years ago at an archaeological site in Israel (Gesher Benot Ya'aqov), making them possibly the oldest documented food in human prehistory. They were cultivated in the Fertile Crescent from at least 7,000 BCE and were traded along the Silk Road from Iran to China and Rome. The Queen of Sheba famously declared pistachios a royal food and forbade commoners from eating them — a cultural resonance that persists in the Middle East where pistachios remain a prestigious gift food.
Nutritionally, pistachios occupy a unique position among tree nuts — they provide the only meaningful lutein and zeaxanthin in the nut category (1405µg/100g), the highest vitamin B6 of any nut (107% RDI, essential for over 100 enzymatic reactions), and resveratrol — the polyphenol associated with the 'French paradox' of low cardiovascular disease in wine-drinking Mediterranean populations. The combination of these three unusual nutritional properties with conventional nut benefits (heart-healthy fats, protein, fibre) makes pistachios nutritionally distinctive even among an already beneficial food category. The 'pistachio principle' in portion psychology — that in-shell eating reduces caloric intake by 41% — is one of the most practically significant findings in snacking behaviour research.