California Ag Network

Tag: nutrition research

  • California Walnut Commission Applauds Emphasis on Nuts in New Dietary Guidelines for Americans

    There is good news for walnuts in the newly released 2025-2030 Dietary Guidelines for Americans (DGAs), which emphasize “real”, nutrient-dense foods — including nuts — as the foundation of a healthy diet.

    The DGAs recognize nuts as a source of plant-based protein and emphasize consumption of healthy fats found in whole foods across multiple age groups and life-stages, and the accompanying report features walnuts on their list of “rich sources of [omega-3] ALA[1].” In addition, for the first time, walnuts are clearly represented in the new food pyramid.

    Further, within a 2,000-calorie diet, the DGAs recommend one ounce of nuts or seeds and two tablespoons of nut or seed butter as part of the three to four daily servings of protein foods. The DGAs also recommend introducing potentially allergenic foods —including nut butters—with other complementary foods to infants at about 6 months.

    “This marks an important step in gaining broader recognition that walnuts, as a healthy and real food, should be part of our daily lifestyle,” said Robert Verloop, CEO of the California Walnut Commission (CWC). “It also is a testament to the 30 years of investment in sound, scientific health and nutrition research by the California walnut industry.”

    While the new DGAs were under development, the CWC leveraged the over 240 published research studies to submit comments and provide evidence showcasing how walnuts can be included in healthy dietary patterns. The CWC continues to support new research in areas such as gut health, sleep and cognitive function, alongside continued investment in heart and metabolic health.

    “Through CWC’s Global Health Research Program, we’re fueling science that speaks to health and wellness, and supporting researchers exploring the topics that truly matter to consumers,” said Rachel Blaine, CWC scientific advisor. “By advancing evidence in these areas, we’re showcasing how walnuts can power overall well-being and inspire people everywhere to make walnuts a delicious part of their daily routine.”

    The DGAs also highlight a broader commitment to American agriculture. “We are realigning our food system to support American farmers, ranchers and companies who grow and produce real food,” according to the DGAs.

    For more information on the 2025-2030 DGAs, visit realfood.gov. For more information about the California Walnut  Commission and its programs, visit walnuts.org.

    About the California Walnut Commission

    The California Walnut Commission (CWC) represents more than 3,700 California walnut growers and approximately 70 handlers, grown in multi-generational farmers’ family orchards. California walnuts, known for their excellent nutritional value and quality, are shipped around the world all year long, with more than 99% of the walnuts grown in the United States being from California. The CWC, established in 1987, promotes usage of walnuts through domestic and export market development activities as well as supports health research with consuming walnuts.

    To explore recipes and learn more about California walnut growers, industry information and health research, visit walnuts.org.

    [1] One ounce of walnuts provides 18g of total fat, 2.5g of monounsaturated fat, 13g of polyunsaturated fat, including 2.5g of alpha-linolenic acid (ALA), the plant-based omega-3.

  • Daily Consumption of Grapes Improves Muscle Strength Markers in Postmenopausal Women

    A new study from the University of California, Davis, published in the peer-reviewed journal Food & Function, provides the first clinical evidence showing that regular consumption of grapes – just 1 ½ cups per day – can improve muscle strength and boost irisin levels in postmenopausal women. The results suggest a promising strategy against age-related muscle decline, also known as sarcopenia. Sarcopenia is the loss of muscle mass and strength. These losses can start as early as age 40 and with progression over time, sarcopenia adversely affects quality of life including degree of mobility, loss of independence, and higher healthcare costs.

    In this study, led by Gerardo Mackenzie, Ph.D., one group of subjects consumed whole grape powder (equivalent to 1 ½ cups fresh grapes per day), while the other group consumed a placebo powder that had none of the beneficial phytonutrients found in grapes. The women consuming grape powder significantly improved their performance on the tests of muscle strength: hand grip and gait speed. Irisin, a hormone that is beneficial for muscle and bone growth, was also measured pre-and post-study interventions. Those consuming grapes had a 14.4% increase in plasma irisin levels, while the placebo group saw a 7.8% decrease in irisin levels, although the changes did not reach statistical significance. However, the research team observed a positive and significant association between changes in grip strength and changes in irisin levels from baseline to the end of the study.

    “These findings indicate that regularly consuming a modest amount of grapes – just 1 ½ cups per day – can help improve muscle strength in postmenopausal women who are at risk for muscle loss as part of aging,” said Mackenzie. “Incorporating grapes into the diet may offer an easy and promising nutritional approach to help mitigate sarcopenia, a condition for which there are no effective treatment options.”