ĂÛÌÒAPP PBRC Researchers Leverage Biomedical Science and Technology to Better Feed, Train, Support U.S. Soldiersâand Everyone
January 18, 2022
Researchers at ĂÛÌÒAPPâs Pennington Biomedical Research Center (PBRC) are putting 20 years of knowledge from working with soldiers into a new app for everyone, a one-stop shop for body and mind health. Itâs called Z!G and although powered by artificial intelligence, itâs not looking for perfection.

Pennington Biomedical researchers Tiffany Stewart and Jennifer Rood have together spent decades working with the Department of Defense to help soldiers both physiologically and psychologically. They jokingly refer to each other as âthe bodyâ and âthe brain.â Rood (right) is a pathologist and microbiologist focused on nutrition, exercise, and injury among high performers, while Stewart (left) is a clinical psychologist who specializes in eating disorders, obesity, and mental health and optimization.
â Elsa Hahne / ĂÛÌÒAPP
Baton RougeâOver the past 30 years, scientists at PBRC have fundamentally changed how American soldiers eat. As the number-one provider of nutrition science for the U.S. Department of Defense (DOD), PBRC researchers are helping to secure the nation by making sure soldiers get the food and drink they need to optimize their performance and protect against injury.
The work impacts every branch of the militaryâArmy, Navy, Air Force, etc. And by leveraging technology, the researchers are putting science to work in the hands of men and women on active duty, as well as their families. A prime example is through the Army H.E.A.L.T.H. (Healthy Eating, Activity, Lifestyle Training Headquarters) app, which more than 15,000 U.S. soldiers have used so far, with regular users improving their performance on physical fitness tests and meeting military weight standards. Unlike most other lifestyle apps where the focus might be on either weight-loss or mental wellness, Army H.E.A.L.T.H. takes a more integrated, whole-health approach, incorporating tools related to weight, nutrition, and fitnessâall integrated with sleep and stress management and mood and mindfulness support. The app offers personalized tools to help users reach specific goals, or just do and feel better on a day-to-day basis.
The Army is now talking with PBRC about making the app available DOD-wide through its own secure âapp store.â To date, the DOD has invested $18 million over 15 years in the development of this program. Meanwhile, the researchers are taking everything theyâve learned from working with soldiers and many of the best parts of Army H.E.A.L.T.H. and retooling them into a new app called Z!G for the general population, which is struggling with many of the same challenges as active-duty soldiers. This includes first responders and frontline medical professionals, but also anyone who lives with high amounts of stress and uncertainty, which might be most of us.
âWorking with the Louisiana National Guard has prepared us exceptionally well to be able to offer an effective tool for the general population.â
Tiffany Stewart, clinical psychologist and director of the Behavior Technology Laboratory at Pennington Biomedical
Through collaboration with the Louisiana National Guard (LANG), a customized version of the app has already been tested by a majority of the stateâs soldiers and their family members, in all 64 Louisiana parishes. (The LANG maintains a total of 183 units in 44 parishes.)
âWorking with the Louisiana National Guard has prepared us exceptionally well to be able to offer an effective tool for the general population,â said Tiffany Stewart, a clinical psychologist, director of the Behavior Technology Laboratory at Pennington Biomedical, and faculty lead for Army H.E.A.L.T.H. and Z!G. âAlthough theyâre soldiers, national guard soldiers live among us as civilians. Besides being deployed overseas, they are often called in for domestic deployments on a momentâs notice, including for search and rescue during hurricanes, COVID-19, and so onâbut theyâre also driving kids to school, live in food deserts, and might struggle to get to the gym, same as we are.â

The new Z!G app translates 20 years of military science into a whole-health app for everyone. It includes everything from activity trackers, customized workouts, and stress-relieving tools to detailed grocery lists for nutritious meals to cook at home. The goal of the app, as the researchers describe it, is to help each individual user ânot be perfect, but happy and healthy.â
â Pennington Biomedical Research Center / ĂÛÌÒAPP
The retooled app includes custom workout generators, meal planning tools (complete with grocery lists), and interactive trackers that encourage incremental changes (âyouâre on your wayâ) rather than piecemeal progress toward distant goals (âyouâre not there yetâ). The researchers have also recently added an artificial intelligence component, so the app can learn about its user and become more responsive to needs and preferences over time. The app was designed to be like a quiet, supportive coach in everyoneâs pocket.
âWhen we first started talking with the Army about a program like this back in 2003,
people thought we were crazy,â Stewart said. âAn anonymous, Internet-based program?
âNobody would use it,â and, âHow ridiculous.â But it worked because it was anonymous
and automated. It took away the stigma of needing or asking for helpânobody had to
know you were struggling.â
âAlso, this was the first tool soldiers and their families could use independentlyâanytime
and anywhereâto sustain health, readiness, and performance on a year-round basis,â
Stewart added. âThe Army had never had programming like this before.â
âThe Army had never had programming like this before.â
âTiffany Stewart
One of the main motivations behind Army H.E.A.L.T.H. came with the realization in the early 2000s (post-9/11 and the beginning of the War on Terror) that the need for soldiers was increasing while the recruiting pool was shrinking. Today, roughly 70% of possible Army recruits are ineligible for service due to many reasons, with overweight and obesity at the forefront.
âAlso, it became obvious that our active-duty soldiers were not immune to weight creep and the obesity epidemic,â Stewart explained. âWhat we were seeing in the general population was true in the Army as well. Soldiers were struggling to stay under established weight-height thresholds, battling diabetes and cardiovascular disease. And while we intended Army H.E.A.L.T.H. as a prevention tool, itâs often used for intervention.â

Captain Michael Switzer with the Louisiana National Guard (LANG) helped turn Army H.E.A.L.T.H. into LANG H.E.A.L.T.H. Heâs been one of the appâs most frequent and vocal users. âH.E.A.L.T.H.â is a trademarked acronym for Healthy Eating Activity Lifestyle Training Headquarters. Going from deployment to deployment, as AP recently reported, Switzer sleeps most nights in his office at Camp Beauregard in Pineville, LA.
â Photo courtesy of Gerald Herbert / AP
Captain Michael Switzer with the LANG is the soldier perhaps most familiar with the ĂÛÌÒAPP/Pennington-developed health app. Not only did he help design the app, but he and his wife have both used it, whether heâs home in Denham Springs (which hasnât been a lot lately) or deployed. Theyâve used the app to stay connected, work together toward shared goals, andâon occasionâcompete with each other. Back in 2005, Switzer lost four men in his unit, including his best friend, during a deployment to Baghdad. He says the appâs mental health and mindfulness tools played an important role in his recovery from those losses combined with daily challenges.
âI've always been physically fit, thatâs never been much of a struggle for me, but coming from three deployments, I was choking up a little bit,â Switzer said. âThe mindfulness techniques in the program were really beneficial to me, especially coming home and transitioning back. If you donât have tools for mental management, anxiety and depression can easily become obstacles for nutrition, fitness, and sleep, so it all goes together.â
More recently, Switzer has been deployed in Louisiana to help stage COVID-19 testing and vaccine sites, do emergency supply runs during storms, clear roads, and rebuild infrastructure. He spends most nights on a cot in his office.
âWhile the Army values military family time both here and overseas, at high op-tempo times, we donât get to spend much time with our families,â Switzer said. âSleeping is sometimes not even an option, so the best you can do is breathe and try to keep yourself calm.â
As a leader in charge of others, itâs not lost on Switzer that have been increasing. The National Guard is not immune to this trend. During Hurricane Ida, the LANGâone of the most deployed in the nationâlost at least one soldier to suicide. Dealing with that and general mental health management can be especially hard when you donât have specialized mental health training, which is commonplace, Switzer said:
âThe app has been a very good tool for me in my life, personally, but itâs also a great leadership tool. Itâs helped me be a better resource for others.â
Captain Michael Switzer, Louisiana National Guard
âThe app has been a very good tool for me in my life, personally, but itâs also a great leadership tool. Itâs helped me be a better resource for others. You want to be able to counsel your subordinate soldiers and veterans in a positive way, and the app is something I can put in their hands and into the hands of younger leaders who are put in charge of soldiers.â
The latest version of the Army H.E.A.L.T.H. app can also help fresh recruits as well as experienced soldiers prepare for the new combat fitness test, which is replacing the older physical fitness test the Army was using since the 1980s (sit-ups, push-ups, and a two-mile run). The new test is designed as a better measurement of soldiersâ readiness on the battlefield and includes lifting, dragging, and carrying. All soldiers are required to pass the test and stay within a certain weight range.
Switzer values how the app has helped the LANG retain soldiers on all levels.

While Tiffany Stewart (left) and her team developed the original versions of their app for the entire U.S. Army, it was through collaboration with the Louisiana National Guard and by working with the majority of its civilian soldiers, including Captain Michael Switzer (center), that the researchers were able to transition the app into an effective tool for the general population. Jennifer Rood (right) is working on biomedical and nutrition research that is impacting not just the Army and the National Guard, but every branch of the U.S. military.
â Elsa Hahne / ĂÛÌÒAPP
âWhen a soldier doesnât meet weight standards or pass physical fitness tests, they canât get promotedâinstead, they lose many of the benefits you get from being in the military,â Switzer said. âSometimes they become ineligible for bonuses, and, in the worst-case scenario, they may even be discharged. In the military, you must meet standards in order to be successful. So, the app is a tool that helps us with retention, which has become even more important as our recruiting pool is shrinking. It puts an evidence-based tool directly into the hands of the soldiers who need it the most.
In 2013, the first female U.S. Army surgeon general, Patricia D. Horoho, recognized the importance of treating soldiers holistically and more as equivalent to athletes. It was after Horoho endorsed the ĂÛÌÒAPP-PBRC Army H.E.A.L.T.H. tool that the researchers were able to pilot it Army-wide.
âWeâve been in protracted wartime since 9/11, and our military needs its soldiersâthey canât just discharge them when theyâre struggling to meet standards, because we desperately need to retain our fighting force,â Stewart said. âThatâs one of the reasons our lab develops technologies to help people change their behaviors and realize that small steps can lead to big change. Itâs hard to make habit changes in the context of chaosâwhether thatâs in the middle of a war or a pandemic or a hurricane, when youâre worried that you or people you care about could be hurt or dieâbut we want to show that you can do tiny things every day, in the context of real life, that build up to something meaningful.â
Jennifer Roodâs lab, meanwhile, has been working on biomarkers in soldiersâ blood that can help predictâand therefore preventâinjury, among other things. One of her recent studies showed that male soldiers who maintain normal testosterone levels can retain and even gain muscle mass while losing weight from fat stores during high-stress times, when theyâre often not eating or sleeping enough. The U.S. Army Research Institute for Environmental Medicine has already invested tens of millions in her work, contributing to the more than $100 million the DOD has dedicated to research at PBRC over the past 30 years.
âItâs hard to make habit changes in the context of chaosâwhether thatâs in the middle of a war or a pandemic or a hurricane, when youâre worried that you or people you care about could be hurt or dieâbut we want to show that you can do tiny things every day, in the context of real life, that build up to something meaningful.â
Tiffany Stewart
While Roodâs research is making an impact on every branch of the U.S. militaryâworld-wideâshe personally cares more about the effect her work is having on specific people, closer to home.
âYou might talk to other scientists, and theyâll say, âI discovered this,â or âI put this new technique on the map,â but for me, itâs more personal,â Rood said.
When she and her husband were finally able to go to an in-person ĂÛÌÒAPP Tigers football game this season, a young man walked up to her and tapped her on the shoulder.
âI couldnât place him at first,â Rood remembered. âBut then I remembered him from one of our studies, and he told me how much heâd learned from it and the difference itâd made for him in his life. If you look at the big picture of the discoveries weâve made, itâs probably a much bigger accomplishment, but for me, walking the streets of Baton Rouge and having people come up to me and tell me how theyâve been able to keep their cholesterol down, or get their diabetes in check, keep the weight off, or get on a new life-changing medication because of our researchâthatâs really powerful.â
âFor the past three decades, the Pennington Biomedical Research Center and their expert staff have been key partners to the Army and Department of Defense in nutrition research. Together, we have made significant discoveries, which have resulted in improved health and performance of the modern Warfighter.â
James McClung, Military Nutrition Division, U.S. Army Research Institute of Environmental Medicine (USARIEM)
The development of the Z!G app for the general population was supported by a 2021 LIFT2 (Leveraging Innovation for Technology Transfer) grant from the ĂÛÌÒAPP Board of Supervisors.
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