A GLP-1 medication reduces appetite, and meals tend to shrink. Smaller meals leave fewer chances to take in fiber, vitamins, minerals, and protein. Research on people taking these medications shows that gaps are common. Here’s what studies have found about nutrient intake on GLP-1 medications and low-appetite days, including where NOVOS Bar fits into your daily intake.
Quick Overview
- GLP-1 medications reduce appetite. In a randomized trial of 72 adults with obesity, those taking semaglutide ate 35% less at an all-you-can-eat lunch than those taking placebo.
- A food-record study of 69 GLP-1 users found average intakes below the Dietary Reference Intake (DRI) for fiber, calcium, iron, magnesium, potassium, and vitamin D.
- A claims analysis of more than 461,000 adults newly prescribed a GLP-1 medication found that 22.4% had a nutritional deficiency diagnosis within 12 months, with vitamin D deficiency the most common.
- NOVOS Bar contains 15g of plant protein, 7g of fiber, and 21 essential vitamins and minerals at 50% of the Daily Value per bar. One bar is a snack and two make a meal.
- NOVOS Bar is not designed to treat or prevent nutritional deficiencies. It adds nutrition on days when a full meal isn’t realistic, alongside food and guidance from a healthcare provider.
Why Eating Less Can Mean Missing Nutrients
GLP-1 medications decrease appetite, with measurable effects on intake. In a randomized, double-blind trial of 72 adults with obesity, those taking semaglutide ate 35% less at an all-you-can-eat lunch after 20 weeks than those taking placebo.
Smaller portions give the body fewer chances to take in the fiber, vitamins, and minerals that a full meal would supply.
What the Research Shows About Nutrient Gaps
A cross-sectional study of 69 adults who had used a GLP-1 medication for at least a month compared three-day food records with the DRI. Average fiber intake was 14.5g against a DRI of 28g. Calcium averaged 863mg (DRI 1,300mg), iron 12.1mg (DRI 18mg), magnesium 266mg (DRI 420mg), potassium 2,186mg (DRI 4,700mg), and vitamin D 4.0mcg (DRI 20mcg).Â
Only 43% of participants reached at least 1.2 grams of protein per kilogram of body weight. That’s the low end of what the authors recommend during weight loss. These adults averaged about 1,748 calories a day, which the authors describe as above expert estimates of GLP-1 users’ needs. So, the gaps appeared even at that calorie level.
A retrospective analysis of insurance claims for 461,382 adults newly prescribed a GLP-1 medication, most with type 2 diabetes, found that 12.7% had a nutritional deficiency or related complication diagnosed at six months and 22.4% at 12 months. Vitamin D deficiency was the most common at 13.6%, followed by nutritional anemia at 4%. A matched comparison with people taking metformin puts those numbers in perspective: At 12 months, 18.6% of GLP-1 users had a deficiency diagnosis versus 16.5% of metformin users.
Both studies have limits. The food-record study was small and relied on self-reported intake, and the claims analysis counted only diagnosed deficiencies, which its authors say likely understates the true number. Neither study tracked whether supplements closed the gaps.
Covering Nutrition on Low-Appetite Days
Three findings from that research point to questions worth bringing to a prescriber or registered dietitian:
- Am I getting enough protein? Only 43% of participants in the food-record study reached the low end of the authors’ protein recommendation during weight loss. Protein also supports muscle.
- Am I getting enough fiber? Average intake in that study was 14.5g, about half of the 28g DRI.
- Should my vitamin D and iron levels be checked? Vitamin D deficiency (13.6%) and iron deficiency anemia (3.2%) were among the deficiencies diagnosed in the claims analysis.
See also: Vitamin D and Longevity: What’s the Ideal Level by Age?
Where NOVOS Bar Fits
Each NOVOS Bar contains 15g of plant protein, 7g of fiber, and 21 essential vitamins and minerals at 50% of the Daily Value, sourced from a fruit and vegetable blend that includes broccoli, kale, spinach, and sweet potato. NOVOS describes one bar as a snack and two as a meal, which brings the vitamins and minerals to 100% of the Daily Value.
Set against the research above, one bar’s 7g of fiber equals one-quarter of the 28g DRI that study participants fell short of. The story behind the bar covers its ingredients in more detail.
What NOVOS Doesn’t Claim
NOVOS Bar is not designed to treat, cure, or prevent nutritional deficiencies, and it doesn’t replace a varied diet, lab testing, or medical guidance. Whether levels like vitamin D or iron need checking is a question for your prescriber or a registered dietitian.
If you’re eating very little for several days, having trouble keeping food down, or noticing new weakness or fatigue, talk to your prescriber. The pillar article on GLP-1 side effects covers the bigger picture.
While NOVOS Bar covers nutrition on low-appetite days, Core supports whole-body health at the systems level. Vital supports organs, including your eyes, skin, gut, and brain, against everyday oxidative and environmental stress, and Boost supports cellular energy metabolism.Â
Not sure where to start? Answer a few short questions to get matched with your longevity protocol.
FAQ About GLP-1 and Nutrient Adequacy
Can GLP-1 medications cause nutrient deficiencies?
Studies link GLP-1 medication use to a modestly higher rate of diagnosed deficiencies. In a matched claims analysis, 18.6% of GLP-1 users had a deficiency diagnosis at 12 months versus 16.5% of metformin users. The design cannot show that the medication caused the difference.
Which nutrients are most likely to run low on a GLP-1 medication?
In one food-record study, average intake fell below the DRI for fiber, calcium, iron, magnesium, potassium, choline, and vitamins A, C, D, E, and K. In claims data, vitamin D deficiency was the most commonly diagnosed.
Can a bar replace a meal on a GLP-1 medication?
NOVOS describes one NOVOS Bar as a snack and two as a meal. It is a convenient option for low-appetite days and does not replace guidance from your prescriber or a registered dietitian.
Should I take a multivitamin on a GLP-1 medication?
Intake studies measure food, and neither study above tracked whether supplements closed the gaps. A provider can check levels such as vitamin D and iron and recommend the best fit for your situation.
Consult your healthcare provider before making changes to your medication, diet, or supplement routine.
