Resources

01Start here2

Two guides that map the rest.

• The GLP-1 nutrition guide: what to eat, drink and watch

  Protein, fiber, fluid, electrolytes and vitamins, each answered in a few sourced lines, with a link to the full article.

• What to eat when you’re eating less: the complete guide

  The long read: protein first, fluids on a schedule, fiber slowly, and the vitamins and minerals that drop when portions shrink.

03Calculators3

Rough estimates against National Academies reference values and USDA food data.

• Nutrition Gap Calculator

  Tap what you ate and drank today to see roughly how far it falls short of the reference intakes for fiber, fluid, potassium and key vitamins.

• Hydration Calculator

  A fluid range for today from the National Academies adequate intake, adjusted for activity, weather and appetite, with the sodium sweat takes.

• Protein Calculator for Small Appetites

  The 0.8 g/kg reference intake and the higher 1.2 to 1.6 g/kg range, in grams, split across three or four small meals.

04Reference tables4

Sortable, with a CSV download and a citation for each. Data from the National Academies and USDA FoodData Central.

• Daily nutrient needs for adults: DRI table by age and sex

  RDA or Adequate Intake and upper limit for 27 vitamins, minerals, water, fiber and protein, for women and men by age group.

• Electrolytes in food: sodium, potassium, magnesium and calcium per serving

  Four electrolyte minerals per serving in 33 common foods and drinks.

• Fiber in food: grams per serving of common foods

  Grams of fiber and calories per serving in 36 common foods, with their FoodData Central ids.

• Protein in small portions: grams per bite-sized serving

  Grams of protein, calories and protein per 100 kcal in 33 small portions of common foods.

05Ingredients15

One page per ingredient: what it is, the intake references and upper limits, what the trials found, and interactions.

Electrolyte minerals

• Sodium

  The 2019 Adequate Intake and the 2,300 mg reduction threshold, sweat losses, hyponatremia and who should be careful.

• Potassium

  The 2019 Adequate Intakes, the blood pressure trials, why there is no upper limit, and medicines that raise blood potassium.

• Magnesium

  The RDA, the 350 mg upper limit for supplements, what trials show, and the medicines it interacts with.

• Calcium

  The 2011 RDA and upper limits, the bone and heart evidence, citrate vs carbonate, and medicine interactions.

Trace mineral

• Zinc

  The adult RDA and 40 mg upper limit, the trials on colds, the copper interaction, and medicines to space it from.

Vitamins

• Vitamin C

  The adult RDA and 2,000 mg upper limit, the trials on colds, and the kidney stone question.

• Vitamin D

  The adult RDA and 4,000 IU upper limit, what the VITAL and D-Health trials found, and medicine interactions.

• Thiamin (Vitamin B1)

  The adult RDA, why no upper limit is set, who runs short, and the diuretic interaction.

• Vitamin B6

  Adult RDAs, the US 100 mg and EU 12 mg upper limits, and nerve toxicity at high doses.

• Folate

  The 400 mcg DFE RDA, what DFE means, folic acid vs 5-MTHF, the 1,000 mcg upper limit and B12 masking.

• Vitamin B12

  The 2.4 mcg RDA, how absorption falls with age, and the metformin and acid-reducer interactions.

Fiber

• Partially Hydrolyzed Guar Gum (PHGG)

  A soluble fiber made from guar gum: the adult fiber Adequate Intake, what the trials found, tolerance, and taking fiber with medicines.

Sweeteners

• Erythritol

  A sugar alcohol: GRAS status, the EFSA 2023 intake limit, the heart-risk studies and their limits, and gut tolerance.

• Monk Fruit Extract (Luo Han Guo)

  Where mogrosides come from, the FDA GRAS notices, and why EFSA could not conclude on safety in 2019.

• Reb M (Rebaudioside M, stevia)

  A steviol glycoside: how it is made, the 4 mg/kg ADI, FDA GRAS notices, and why whole-leaf stevia is different.

06Glossary1

The terms the rest of the site uses, defined once.

• Glossary

  80 nutrition, label and research terms in plain English, from RDA, UL and PHGG to gastric emptying, each with a primary source.

07Articles60

The Lighter Days guides, by topic. Each opens with the answer and closes with its references.

The medicines

• GLP-1 medications: every approved shot and pill, and what is coming

  One table of every GLP-1 medicine in the US: receptors, how each is taken, approval status and headline trial.

• The once-weekly GLP-1 injection and daily tablet: what the label says

  Approved uses with dates, the trials, the label dose steps, every warning, and self-pay prices as of November 2026.

• The dual GIP/GLP-1 medication: what the label says

  Approved uses with dates, the trials, the label dose steps, every warning, and self-pay prices as of November 2026.

• The daily non-peptide GLP-1 pill: trials, approval and price

  How it differs from the other GLP-1 tablets, trial results by dose, the label, and the dated approval record.

• Compounded GLP-1 medications: are they legal, and what changed

  The shortage list, the grace periods, FDA warnings and court rulings, and the questions to ask a pharmacy.

• The triple agonist in trials: adverse events by dose

  What phase 2 and phase 3 reported against placebo, peer-reviewed and topline marked apart.

• The triple agonist: is it approved, and what might it cost

  No legal price yet; what its approved siblings cost, coverage, and why gray-market vials are a bad idea.

• The weekly dual agonist vs the weekly GLP-1: the head-to-head trial

  A side-by-side table, the one head-to-head trial, label doses, adverse events, cost and coverage.

• The dual agonist vs the weekly GLP-1 for type 2 diabetes: the head-to-head trial

  Blood sugar and body weight results, approved uses, label doses, adverse events and cost.

• A weight-management dual agonist vs a diabetes GLP-1: what differs

  Different molecules and different approvals, the trials that compared them, doses and cost.

• Two brands of the same dual agonist: what actually differs

  Approved uses, label doses, forms, coverage rules and price, side by side.

• Is the generic name the same as the brand? The weekly GLP-1 explained

  Every brand of the molecule, the tentative generic, and what unbranded versions are.

• The daily GLP-1 tablet vs the weekly injection

  How each is taken, trial results, adverse events, switching and self-pay prices.

• Two weekly GLP-1 injections for type 2 diabetes: the head-to-head trial

  Blood sugar and body weight results, outcome trials, label doses and cost.

• The triple agonist vs the dual agonist: what is known

  Separate trials side by side, the head-to-head still running, status and availability.

• The dual agonist label, every adverse reaction by dose

  Rates against placebo, warnings, timing, what to eat and drink, and when to call.

• What every GLP-1 medication costs without insurance

  List prices, maker cash programs, savings cards, Medicare and Medicaid, as of November 2026.

• Low-dose GLP-1 use: what the evidence shows

  What low-dose trial arms found, what the labels say, and the risks of unapproved sources.

• GLP-1 price tracker, updated monthly

  List prices, maker cash prices and savings cards for every brand, with a dated log of changes and a CSV download.

• The GLP-1 pipeline: approved, under review and in phase 3

  Every medicine in development with its stage and headline result, a 12-month watch list and a CSV download.

• Dose schedules as printed in the FDA labels

  One table per approved product, copied from its label. Label information, not advice. CSV download.

• What to eat and drink for each common GLP-1 symptom

  Thirteen symptoms: how common, what the guidance suggests eating, what to limit and when to call. CSV download.

Eating

• GLP-3: what it is, how it compares, and when it's expected

  What the nickname means, phase 2 and phase 3 trial results, adverse events reported in trials, the dated approval record, and why "research" vials sold online are unsafe.

• GLP-1 snacks: 18 high-protein snacks for a small appetite

  Fridge, no-fridge and drinkable snacks with the protein, calories and water in each, counted from USDA data.

• GLP-1 recipes: 8 small, high-protein recipes

  Single-serving smoothies, eggs, salmon, cottage cheese and soups with 11 to 24 g of protein each, counted from USDA data.

• What to eat on a GLP-1: a simple daily plate

  A protein-first plate, the foods to lean on and limit, and a sample day, from the 2025 joint advisory.

• What to eat on a GLP-1 when you’re not hungry

  Eat by the clock, keep portions small and choose protein-dense foods, with a table of easy options.

• What is the GLP-1 diet?

  Not an official plan: the eating pattern medical societies recommend alongside GLP-1 medications, four key numbers, and the myths.

• Eating once a day on a GLP-1: is it a problem?

  Why one sitting rarely holds a day’s protein, fluid and vitamins, and how to add small meals.

• What to eat on queasy days on a GLP-1

  Small low-fat meals every 3 to 4 hours, steady sips, a sample day, and when to call your prescriber.

• Foods to avoid on a GLP-1, and why

  No food is banned. What tends to sit badly when the stomach empties slowly, the sources, and what to choose instead.

• How many calories to eat on a GLP-1

  No label gives a number. The federal reference ranges, why eating too little matters, and the signs to raise with a prescriber.

• A small-appetite day on a once-weekly GLP-1 medication

  A sample day with protein amounts, and what to plan around injection day.

• A small-appetite day on a dual GIP/GLP-1 medication

  Small protein-first meals every 3 to 4 hours, a sample day with 87 g of protein, and planning for injection day.

• GLP-1 food list: what to eat more of, and what to go easy on

  Foods by group with protein and fiber per portion, and a free 7-day eating plan.

Protein and muscle

• Best protein powder for a GLP-1: how to choose one by the label

  Protein per serving, added sugars, whey isolate versus concentrate, whey versus plant, and what a 2025 lead test of 23 powders and shakes found.

• How much protein should you eat on a GLP-1?

  The RDA, the 1.2 to 1.6 g/kg range from the 2025 joint advisory, a table by body weight, and how to reach it.

• Keeping muscle while on a GLP-1

  Strength training twice a week and enough protein: the trial numbers, and a simple week.

Hydration

• Coffee on a GLP-1

  What each label says, the 30-minute rule for some daily GLP-1 tablets, caffeine per cup, and whether coffee counts toward fluid.

• How much water should you drink on a GLP-1?

  The National Academies reference amounts, a simple daily schedule, how to check hydration, and when electrolytes matter.

• Do you need electrolytes on a GLP-1?

  Electrolytes come from food, so intake falls when you eat less. When extra makes sense, when it doesn’t, and how to read a label.

• What to drink on a GLP-1 besides water

  What milk, broth, tea, coffee, sparkling water, electrolyte drinks, juice and alcohol each add, and which to limit.

• Can you drink alcohol on a GLP-1?

  What the labels say, why a drink can hit differently on a small appetite, who should be careful, and what to ask.

• How to choose an electrolyte drink on a GLP-1: a label-reading guide

  Sodium, potassium, magnesium and sugar per serving against official references, and how an oral rehydration solution differs.

• GLP-1s, thirst and dehydration: why you may not feel thirsty

  Why these medications can blunt thirst, the kidney warning in the prescribing information, a rough fluid guide, and when to call.

Vitamins and supplements

• What supplements to take with a GLP-1

  The nutrients a 2025 joint advisory names, a shortlist with doses and limits, and how to decide what you need.

• Which vitamins matter on a GLP-1

  Vitamin D, B12, B1, C and more: why they run low, with RDAs, upper limits and the signs worth a blood test.

• Products sold under the GLP-1 name, and what they can’t do

  A marketing term with two meanings, neither of which works like a GLP-1 medication. How to tell them apart.

• Patches, boosters and "natural GLP-1": what the evidence says

  What they contain, why a GLP-1 drug cannot cross skin, and the human evidence on each ingredient.

• Nature Made GLP-1 Companion Health Pack and Replenish, label to label

  Both labels side by side, price per day, and how to choose by what you need.

Energy and regularity

• Why GLP-1s can leave you tired

  The usual causes, from less food and fluid to low protein or a nutrient running low, and what to check.

• Tiredness on once-weekly GLP-1 medications: the label figures

  Fatigue rates by dose against placebo, from the prescribing information, with a checklist for low-appetite days.

• Tiredness on a dual GIP/GLP-1 medication: the label figures

  Fatigue rates against placebo, when tiredness tends to peak, and a low-appetite intake checklist.

• Fiber and staying regular on a GLP-1

  Fluids, fiber from food added gradually, movement and routine, with a food table and when to call your prescriber.

• How much fiber a day on a GLP-1?

  14 g per 1,000 calories, about 20 g at 1,400: a table by calories, and the foods with the most fiber per bite.

• Constipation on a dual GIP/GLP-1 medication: fiber, fluid and when to call your prescriber

  The label rates against placebo, fiber per bite, how fast to add it, and fluid.

• Fiber supplements on a GLP-1: psyllium vs PHGG vs inulin vs methylcellulose

  Gel, fermentation, gas and the doses studied, and how to take fiber alongside a GLP-1 medication.

• Constipation on GLP-1 medications: label rates and laxative evidence

  Rates against placebo for each medication, why it happens, laxative types by guideline grade, and red flags.

Hair and skin

• GLP-1 medications and hair shedding

  Usually telogen effluvium: temporary, and tied to how fast body weight falls. What the 2026 studies found.

• Hair shedding on dual GIP/GLP-1 medications: what the trials recorded

  Rates by medication and dose from the prescribing information, against placebo, and why women reported more.

08How Lighter Days is made3

Who writes it, how it is sourced, and how errors are corrected.

• Editorial policy: how Lighter Days is written, sourced and kept current

  Who writes, what we cover and won’t, medical review, and how we keep our own product out of the evidence.

• Sourcing and corrections policy

  The order of evidence we rely on, how citations and dates work, and how to report an error.

• Jeff Zorn

  Exercise science and nutrition degree, former college basketball player, two years on a GLP-1 medication.