Best Protein Shakes for Intermittent Fasting in 2026
On this page 7 sections
- Protein Shakes Comparison for Intermittent Fasting
- Best Ready-to-Drink Protein Shakes for Intermittent Fasting
- What Makes a Protein Shake Good for Intermittent Fasting
- How to Choose the Right Protein Shake for Your Fasting Schedule
- Who Should Pick Each Protein Shake and Why
- How Protein Shakes Fit Into Your Intermittent Fasting Health Goals
- More Questions, Answered
Protein Shakes Comparison for Intermittent Fasting
| Rank | Model | Best for | Protein per serving (g) | Sugar per serving (g) | Calories per serving | Price |
|---|---|---|---|---|---|---|
| 1 | Premier Protein +Energy 30g High Protein Shake Café LatteBest for Energy Boost | Most people doing intermittent fasting who want caffeine and high protein | 30 | 1 | 160 | Check price |
| 2 | SlimFast Protein Shake Vanilla Meal ReplacementBest Meal Replacement | Those needing a convenient meal replacement with moderate protein and fiber | 20 | — | — | Check price |
| 3 | Atkins Vanilla High Protein Shake Keto FriendlyBest Keto Friendly | People on keto diets who want a low carb, low sugar protein shake | 15 | 1 | — | Check price |
| 4 | Country Farms All-in-One Super Shake Plant Protein ChocolateBest Plant-Based Shake | Those wanting plant protein with natural ingredients and digestive support | 15 | — | — | Check price |
| 5 | Atkins Strawberry Protein Shake Low Carb Keto FriendlyBest for GLP-1 Users | People on keto or low-carb diets, including those on GLP-1 medications | 15 | 1 | — | Check price |
Intermittent fasting requires careful meal choices to maintain muscle and control hunger. Protein shakes that are low in sugar and carbs and high in quality protein can help you meet your goals without breaking your fast.
This guide highlights top ready-to-drink protein shakes suited for intermittent fasting, what to look for, and how to pick the right one for your needs.
Best Ready-to-Drink Protein Shakes for Intermittent Fasting
Premier Protein +Energy 30g High Protein Shake Café Latte
SlimFast Protein Shake Vanilla Meal Replacement
Atkins Vanilla High Protein Shake Keto Friendly
Country Farms All-in-One Super Shake Plant Protein Chocolate
Atkins Strawberry Protein Shake Low Carb Keto Friendly
What Makes a Protein Shake Good for Intermittent Fasting
The best protein shakes for intermittent fasting are those that support muscle retention without disrupting your fast. A serving should provide at least 15 to 20 grams of protein to help prevent muscle loss during fasting periods.
Low sugar and carbohydrate content is crucial. Sugar spikes insulin, which can break your fast and interfere with fat burning. Aim for shakes with 1 to 3 grams of sugar and minimal carbs to keep insulin stable.
Minimal additives and artificial sweeteners are better tolerated during fasting. Some sweeteners can trigger insulin or cause digestive upset, so choose shakes with clean ingredient lists.
Optional caffeine in a protein shake can help maintain energy and focus during fasting windows, especially if you feel sluggish. A moderate caffeine dose, similar to a small cup of coffee, is enough.
Calorie count needs to fit your fasting plan. If you consume protein shakes during your eating window, look for options between 150 and 300 calories per serving, depending on your goals.
People with kidney concerns should consult their healthcare provider before increasing protein intake, as too much protein can strain kidney function. For high blood pressure, choose shakes low in sodium and added sugars to avoid raising blood pressure.
| Drink | Protein per serving | Servings | Total |
|---|---|---|---|
| Premier Protein +Energy Shake | 30 g | 1 | 30 g |
| Atkins Vanilla Protein Shake | 15 g | 1 | 15 g |
| Total | 45 g | ||
| Protein per serving for muscle retention (30 g) | 150% | ||
How to Choose the Right Protein Shake for Your Fasting Schedule
Pick a protein shake based on when you plan to consume it and how long you want it to satisfy your hunger. Fast-digesting proteins like whey isolate work well right after your fast to quickly repair muscles.
Slow-digesting proteins such as casein or plant-based blends are better if you want longer-lasting fullness, helping curb appetite between meals.
Consider the caffeine content if you need an energy boost, especially during fasting periods. Some shakes add caffeine, but avoid those with too much if you are sensitive or consume other caffeinated drinks.
Serving size matters. Match it to your calorie goals so you don’t eat more than planned. A 150 to 300 calorie shake fits most intermittent fasting eating windows.
Avoid shakes that spike insulin or cause hunger soon after drinking. Some sweeteners and added sugars can trigger cravings or blood sugar swings.
Protein shakes can get flaky when mixed if the protein powder is low quality or the liquid is too cold. Using a high-speed blender or choosing ready-to-drink shakes avoids this issue.
Who Should Pick Each Protein Shake and Why
Protein shakes can fit different needs depending on your health goals and conditions. Premier Protein +Energy is a solid choice if you want caffeine to boost energy during your eating window while supporting muscle recovery with 30 grams of protein and only 1 gram of sugar.
SlimFast shakes offer moderate protein content around 16 grams and are designed to replace meals, which can help with calorie control but provide less protein for muscle retention during fasting.
Atkins shakes are tailored for keto and low-carb diets, typically containing about 15 grams of protein with very low sugar and carbs, making them ideal if you want to maintain ketosis while getting enough protein.
Country Farms All-in-One Super Shake focuses on plant-based protein and includes fiber to support gut health, a good option if you prefer vegan shakes and want digestive benefits alongside protein.
If you have kidney concerns or high blood pressure, choose shakes carefully. High protein intake can affect kidney function in sensitive individuals. It’s best to consult your doctor before adding protein shakes to your routine, especially if you have kidney disease or chronic hypertension.
Protein shakes can be part of a blood pressure-friendly diet if they are low in sodium and sugar. Check the nutrition label for sodium content to avoid spikes in blood pressure.
Protein shakes are generally safe for kidneys in healthy adults, but those with existing kidney disease should avoid high-protein products or use them only under medical supervision.
How Protein Shakes Fit Into Your Intermittent Fasting Health Goals
Protein shakes support intermittent fasting by preserving muscle mass during fasting periods, which is key to maintaining metabolism and strength.
Protein slows digestion and helps control hunger, making it easier to stick to your fasting schedule without intense cravings.
The thermic effect of protein means your body burns more calories digesting it compared to fats or carbs, which can modestly support your calorie burn during eating windows.
Balance your protein shakes with whole foods during eating periods to get a full range of nutrients. Shakes alone shouldn’t replace varied meals over the long term.
Protein shakes aren’t harmful when used appropriately. However, boosting your protein intake abruptly or relying solely on shakes without whole foods can cause digestive upset or nutrient gaps.
Track your hunger and energy levels after drinking protein shakes, and adjust the amount and timing based on how you feel. This helps optimize your fasting and eating cycles.