New study co-funded by INC reveals nut consumption is associated with reduced weight gain

July 2017. This recent study published in the European Journal of Nutrition investigated the association between nut intake and changes in body weight after 5 years of follow-up. Researchers also estimated the risks associated with overweight or obesity after higher nut consumption[i].

Nuts are energy-dense foods; they can provide 160-200kcal per serving (30g-a handful), so the concern that high nut consumption may lead to weight gain persists. For that reason, the present study aimed at analyzing if a frequent nut intake incorporated into a normocaloric, standard diet leads to weight gain.

373,293 participants were recruited between 1992 and 2000 from 10 European countries in the frame of the European Prospective Investigation into Cancer and Nutrition (EPIC) study. Body weight was measured at the beginning of the study and after a median follow-up of 5 years, and food consumption was assessed by country-specific validated food-frequency questionnaires. Results observed that those participants who consumed more nuts (more than one serving per week) gained less weight when compared to non-consumers. On the other hand, the frequency of nut consumption was associated with a 5% lower risk of becoming overweight or obese. Participants with a normal weight who consumed more nuts (6g/day) had a 5% lower risk of becoming overweight or obese compared with non-nut consumers. At the same time, overweight individuals at baseline also had a 5% lower risk of becoming obese.

The study concluded that a higher nut consumption was associated with less weight gain after 5 years and also a lower risk of overweight or obesity. Thus, these findings support dietary recommendations to increase nut intake and include them in our diet.

“This is the largest study ever conducted, showing that nuts are a non-fattening healthy food” said Dr. Joan Sabate, Professor of Nutrition at Loma Linda University and Senior Investigator of this research.

This study was supported by the INC International Nut and Dried Fruit Council.


About the International Nut & Dried Fruit Council

INC members include more than 700 nut and dried fruit sector companies from over 70 countries. INC is the leading international organization regarding nuts and dried fruit health, nutrition, statistics, food safety, international standards, and regulations.

[i] Freisling H, et al., 2017. Nut intake and 5-year changes in body weight and obesity risk in adults: results from the EPIC-PANACEA study. Eur J Nutr.




SIZA Guide to Law and Best Practice in Fire Safety on Farms

SIZA has complied a useful guide to the law and best practice in fire safety on farms.







Grootplaas Onderhoud – 25 Julie 2017 – Elsje Joubert

  • Elsje Joubert, waarnemende tegniese bestuurder van Subtrop, gesels oor die subtropiese vrugtebedryf en gee raad oor stinkbesies en makadamiaboerdery.


U.S.: FDA approves macadamia heart health claim

The macadamia industry has received a boost this week after the U.S. Food and Drug Administration (FDA) granted a petition to allow a qualified health claim connecting the nut’s consumption to a reduction in the risk of coronary heart disease (CHD).

The claim is quite specific however, with the following wording put forth by Royal Hawaiian Macadamia Nut, Inc. in its request to the regulator:

“Supportive but not conclusive research shows that eating 1.5 ounces per day of macadamia nuts, as part of a diet low in saturated fat and cholesterol and not resulting in increased intake of saturated fat or calories may reduce the risk of coronary heart disease. See nutrition information for fat [and calorie] content,” states the now permitted claim.

The decision comes almost two years after the petition was initially filed, putting the native Australian nut in the same league as other nuts renowned for their health benefits such as walnuts and almonds.

“This is a truly a historic day for everyone in the macadamia nut industry,” Scott Wallace of Royal Hawaiian Macadamia Nut said in a release.

“Research about the benefits macadamia nuts have for heart health has existed for decades, and we’ve worked tirelessly to secure the legal right to share this with the masses.

“Many people associate almonds, pistachios and walnuts with better health, but this momentous decision from the FDA now puts macadamia nuts in a similar category.”

In the release, the company highlighted macadamia nuts have no cholesterol and are high in monounsaturated fats – the same healthy fats found in olive oil and avocados, which are known to help reduce bad cholesterol levels and can lower risk of heart disease and stroke.

Scientists first discovered that adding macadamia nuts to the diet appeared to lower the amount of LDL cholesterol in the blood during the 1990s and 2000s.

Since then, researchers have been exploring the connection, resulting in a growing body of scientific evidence supporting that a diet including macadamia nuts can help lower LDL cholesterol levels.

One ounce of macadamia nuts (about 15 nuts) is also an excellent source of thiamin and manganese, a good source of dietary fiber and copper, and contains protein, magnesium, iron and phytosterols.

Taken from:



The Southern African Macadamia Growers’ Association (SAMAC) will hold its annual Research Symposium on 6 September 2017. The event will take place on the North Coast of KwaZulu-Natal for the first time – one of the rapidly expanding regions of macadamia plantings in South Africa, with the potential of becoming the country’s largest macadamia production region in the future.

The programme will include researchers that currently have projects funded by SAMAC, as well as several external presenters, which may bring a fresh outlook to some of the macadamia industry’s challenges. A wide range of topics will be addressed:


Macadamia Health Research

Macadamia Water Usage / Irrigation

Macadamia Genetics and Biotechnology

Remote Sensing Technologies

Macadamia Pests and Diseases

Biological Control



The symposium will be held in the Zulu Theatre at Sibaya Casino near the King Shaka International Airport. The event will finish on a high with a formal gala dinner in the evening, where several industry awards will be presented.

For more information or to register, visit the SAMAC Research Symposium Page


Issued by the Southern African Macadamia Growers’ Association (SAMAC)
24 July 2017
Contact: Barry Christie
Tel: +27 73 084 1772





The Southern African Macadamia Growers’ Association has conducted a final crop forecast survey for the 2017 season. The updated forecast is 42 000 tons of nut-in shell (1.5% kernel moisture content), which is 570 tons more than the forecast that was issued in May due to higher participation from handlers in the industry. The macadamia industry is still suffering from the effects of a severe drought that lead to a crop of 38 000 tons in 2016, compared to 46 000 tons that were produced in 2015. It is evident that the Limpopo Province is under more constraint and many handlers have submitted a lower forecast for this province than previously. In contrast, Mpumalanga Province has a slightly higher forecast, which could be due to the many new plantings that has come into production for the first time, since it remains the province with the most new plantings annually and also because the Lowveld of Mpumalanga is the main producing region due to having the most hectares planted to macadamias. Fifty five percent (55%) of the 2017 crop is expected to be produced in Mpumalanga (Table 1).

Mr Walter Giuricich, chairman of SAMAC, encouraged the industry to process more macadamias to kernel in order to satisfy the high demand for kernel. “Some of the country’s highest quality macadamias is being exported as inshell, whereas lower quality nuts are often processed and sorted in order to ensure that high quality products leave South Africa’s shores”, Giuricich said. Approximately 49% of the crop is expected to be processed to kernel this year, as opposed to 64% that was processed to kernel in 2016.


Issued by the Southern African Macadamia Growers’ Association




The Southern African Macadamia Growers’ Association has conducted a round of data collection from approximately 80% of the registered handlers representing approximately 95% of the macadamia industry’s total production volume. The updated forecast is 41 430 tons of nut-in shell (1.5% kernel moisture content), which is slightly lower than the previous forecast of 42 000 tons. It is suspected that many new plantings will come into production for the first time, resulting in a slight increase in production from 2016. The macadamia industry is still suffering the effects of a severe drought that lead to a crop of 38 000 tons in 2016, compared to 46 000 tons that were produced in 2015. Mpumalanga remains the largest production region with 51% of the forecasted volumes predicted to come from this province, followed by Limpopo (26%) and KwaZulu-Natal (21%). The remaining 3% of the crop is expected to come from other regions such as the Eastern and Western Cape Provinces. An updated forecast will be done during June 2017.

New data has also been received from macadamia nurseries on their 2016 tree sales volumes. The new data, received from approximately 90% of the nurseries and representing approximately 95% of the industry, shows that 1 132 110 macadamia trees were sold in South Africa during 2016. This is the equivalent of 3 538 hectares at a planting density of 320 trees per hectare. ‘Beaumont’ remains the most-widely planted cultivar, comprising 49% of the total sales, followed by A4 (22%) and 816 (16%). Mpumalanga remains the province with the most new plantings, absorbing 49% of the total trees produced, followed by KwaZulu-Natal (33%), Limpopo Province (10%), Western Cape (3%) and other destinations (5%). In 2016 it was reported that more than 70% of trees were sold in Mpumalanga during 2015. It is evident that the growth in new plantings in KwaZulu-Natal is on the increase and it is expected that this province will become a major growing-region in the future.

Issued by the Southern African Macadamia Growers’ Association (SAMAC)
29 May 2017

Contact: Barry Christie
Tel: +27 73 084 1772


Research Symposium 2016 Presentations

Prof Bernard Slippers_FABI

Prof. Bernard Slippers – 08:40

The power of successful industry-macadamia collaborations: Critical mass, leverage and impact.

Mark Penter_Cultivars

Mark Penter – 09:15

Selection and evaluation of new cultivars for the South African macadamia industry.

Willem Steyn_EPNs

Willem Steyn – 09:35

Investigations into the use of EPN’s for the possible control of the nut borer complex and the impact of it on the thrips complex occurring on macadamias in South Africa

Maritha Schoeman_Huskrot

Maritha Schoeman – 09:55

Evaluation of fungicides for controlling husk rot in macadamias.

Alex Whyte_GFNC Sponsor

Green Farms Nut Company – 10:15

Prestige Sponsor Presentation by Alex Whyte

Dr Gerhard Verdoorn_Chemicals

Dr. Gerhard Verdoorn – 11:00

Pesticide use in macadamias: Important factors to consider.

Mark Penter_Discolouration and Rancimat

Mark Penter – 11:35

Discolouration of SA macadamias and Rancimat as a tool for kernel shelf-life predictions and determination of risk factors affecting quality and shelf-life in the harvest and storage of macadamias.

Dr Schalk Schoeman_IPM

Dr. Schalk Schoeman – 11:55

Integrated management of macadamia pests.

Prof Peter Taylor_Bat stinkbug control

Prof. Peter Taylor – 12:15

New Findings on the potential for bats to control lepidopteran pests of macadamias.

De Villiers Fourie_Resistance

De Villiers Fourie – 12:30

Investigation of possible pyrethroid resistance developing in the two-spotted stinkbug, Bathycoelia Distincta, on macadamias in South Africa.

Stephan Schoeman_Surface Crusts

Stephan Schoeman – 12:40

Breaking surface crusts in macadamia orchards.

Prof Ben Botha_Pheromones re

Prof. Ben Botha – 14:35

Development of synthetic pheromones for the control of stinkbug.

Lindi Botha_Rearing stink bugs

Lindi Botha – 14:55

Rearing of stinkbugs: some interesting and possible useful observations.

Andre Botha_Traps

Andre Botha – 15:10

Evaluating pheromone traps for stinkbugs.

Colleen Hepburn_Stored Product Pests

Colleen Hepburn – 15:20

Awareness of stored product pests.

Nontokozo Kunene_Phytophthora

Nontokozo Kunene – 15:30

Let your soil speak for you…Are you Phytophthora free?

Christiaan Saaiman_Harvest

Christiaan Saaiman –

New app development for farming data – Harvest

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