TrainersBookCan personal trainers give nutrition advice?
Training is where clients start, and food is where many of them stall. You do not need to become a dietitian to help, but you do need to know where your role ends, how much structure each client needs and how to adjust a target without guessing. Here is the line, a four-step ladder, a calculator that uses the client's own food log, and messages to copy.
Where your role ends
Yes, in most places personal trainers can give nutrition advice to healthy adults, as long as it serves a training goal and does not depend on a health condition. Exactly what you may advise differs between countries, certifications and insurers, so check yours. The split below is a common one. The rule of thumb: you coach eating habits and energy for a training goal. Anything that depends on a health condition belongs with a doctor or a registered dietitian.
Usually your role:
- General healthy eating, based on your national dietary guidelines
- Calorie and protein targets for a weight or performance goal
- Food logging, feedback on the log and meal ideas
- Eating around training: timing, protein, fluids
- Habits: regular meals, planning, shopping, eating out
Refer to a doctor or registered dietitian:
- A medical condition that affects what the client can eat, such as diabetes, kidney, heart or digestive problems
- Pregnancy and breastfeeding
- Medication that affects appetite or weight
- Food allergies that shape the whole diet
- Signs of a difficult relationship with food
When to stop counting. Rigid rules about food, distress over a day that was not logged, skipping meals or adding training to make up for eating, fast weight loss or secrecy around food are reasons to put the numbers away. Talk to the client privately, without judgement, and suggest they see a doctor. Keep coaching their training if they want to.
Referring is easier with words ready. Here is one way to say it:
That is outside what I can advise on as your trainer, and I want you to get it right. A registered dietitian is the right person for this, and your doctor can refer you. I will keep coaching your training, and when you have their advice we can make sure the program fits around it.
The nutrition ladder: four steps
Not every client should count calories. Most do better starting with less structure and adding more only when the goal needs it. Think of it as a ladder. Start each client on the lowest step that can move their goal, and move up only when the step they are on is solid.
Step 1: Habits
For: clients new to structure, busy clients and anyone who has had a bad experience with counting. You set: two or three habits, such as protein at every meal, vegetables at two meals a day and regular meal times. The client: takes a photo of each meal, so you both see the week. Move up when: the habits hold on most days for two or three weeks and the goal needs more precision.
Step 2: Portions
For: clients who eat regularly but cannot tell whether it is too much or too little. You set: portions by hand size: a palm of protein, a fist of vegetables, a cupped hand of carbohydrates and a thumb of fat per meal. A common starting point is one of each, two for larger or more active clients. Move up when: the portions are steady but progress stalls for three weeks.
Step 3: Targets
For: clients with a clear weight goal who are willing to log. You set: a daily calorie target and a protein target. 1.6 to 2.2 grams per kilo of body weight is a common range for people who train regularly. The client: logs food on most days and weighs in a few times a week. Move up when: the client wants more precision, for example before an event.
Step 4: Plan
For: clients who want to be told what to eat, or who need precision for a short period. You set: calories, protein, carbohydrates and fat, and a meal plan built from recipes the client already likes. The client: follows the plan, logs and weighs in. Change the target every two weeks or so, based on what the log and the scale say.
Moving down a step is not failure. A client who is stressed by logging often keeps more progress on step 1 than they would by forcing step 4.
Set a pace, not just a number
A calorie target on its own says nothing about how fast the client should change. A pace does. Set it as a share of body weight per week, so the same plan fits a 60 kilo and a 100 kilo client. These are the paces in TrainersBook, with what they mean for a client who weighs 80 kilos:
| Pace per week | 80 kg client | Difference per day |
|---|---|---|
| Lose 0.25 % (gentle) | −0.2 kg | −220 kcal |
| Lose 0.5 % (steady) | −0.4 kg | −440 kcal |
| Lose 0.75 % (fast) | −0.6 kg | −660 kcal |
| Lose 1 % (aggressive) | −0.8 kg | −880 kcal |
| Gain 0.1 % (lean) | +0.08 kg | +90 kcal |
| Gain 0.25 % (steady) | +0.2 kg | +220 kcal |
| Gain 0.5 % (fast) | +0.4 kg | +440 kcal |
The difference per day assumes about 7,700 kcal per kilo of body weight. It is an estimate, which is why the target gets checked against the scale after a few weeks. Faster loss costs more energy in training and is harder to keep. Faster gain adds more fat along with the muscle.
For the starting point, use the calorie calculator. A formula is a good first guess, but it is only a guess. After three weeks of logging you can do better.
Find maintenance from the food log
If a client has logged most days and weighed in regularly for two or three weeks, their own numbers tell you more than any formula. Average intake, minus the energy in the weight they lost or gained, is what they actually burn.
Maintenance = average intake − (weight change per week × 7,700 ÷ 7)
An example. A client averaged 2,100 kcal a day and went from 80.9 to 80.0 kilos in 21 days. That is −0.3 kilos a week, or about 330 kcal a day below what they burn, so maintenance is about 2,430 kcal. To lose 0.5 % a week from here, the new target is about 1,990 kcal.
Two things make the answer reliable. Use the average of several weigh-ins at the start and at the end, not single mornings. And only trust it if the client logged at least five days out of seven, including weekends. Gaps in the log almost always hide food, never the other way round.
The two-week nutrition check-in
Calorie targets fail most often because they change too often. One heavy weigh-in, one cut of 200 kcal, and three weeks later nobody knows what worked. Use the same order every time and change the target no more than every two weeks.
- Was it logged? Fewer than five days out of seven, and the answer is to log, not to change the calories.
- Was the target hit? If the average is more than about 10 % from the target, work on hitting it before you change it.
- What does the trend say? Compare the average weight this week with the average two weeks ago. Single weigh-ins move with water, salt and sleep.
- Compare with the pace. On pace: keep going. Off pace: work out the new target with the calculator above.
- Wait. After a change, give it two weeks before you judge it.
- Plan a break. After about 12 weeks in a deficit, many coaches plan two weeks at maintenance before going on.
Questions to send before the check-in:
Nutrition check-in: 1. How many days did you log this week? 2. Your weigh-ins this week. 3. Hunger from 1 to 10. 4. Energy in training from 1 to 10. 5. Which meal or time of day was hardest? 6. One thing that went well.
And a reply to adapt when the target changes:
Great work, [name]. You logged [6 of 7] days and your weight is down [0.3 kg] a week on average. That is a little slower than we planned, so from Monday your target is [1,990 kcal] a day, with protein the same. Same check-in in two weeks. Hunger above 7 most days? Tell me before then.
For the client who has stopped logging, skip the numbers:
Hi [name], I noticed the food log has been quiet this week, and that is completely normal. No need to fill in the gaps. Can we start again from today with just [breakfast and lunch]? Send me a photo, nothing else.
Meal plans that move with the target
A meal plan works best when it is built from food the client already eats. Ask for three meals they like and would happily repeat, and build the plan from those, not from a perfect week they will never cook.
- Two to four recipes per meal slot is enough. More choice means more shopping, not more success.
- Separate training days and rest days if the client's appetite and schedule differ between them.
- Keep the recipe, change the portion. When the target goes up or down, scale the portions instead of writing a new plan.
- Plan for the hard days. One default meal for eating out and one for a late evening cover most slips.
In TrainersBook: build a meal plan from recipes with ingredients from the food database, and the app works out calories and macros per serving. Add a note, choose the active days and a start date, and send it. The portions follow the client's calorie target, so the same recipes still fit when the target changes. Several plans can run at once, such as one for training days and one for rest days, and you can pause them. Plan the phases ahead too: a deficit, a gradual increase back to maintenance, maintenance, or a surplus.
For the client's side of food logging, see the calorie and macro tracker. For everything nutrition in the app, see the nutrition coaching app.
Common questions
Can personal trainers give nutrition advice?
In most places, yes, as general advice for healthy adults: healthy eating based on national guidelines, calorie and protein targets for a training goal, and feedback on a food log. Advice for a medical condition, pregnancy or a difficult relationship with food belongs with a doctor or registered dietitian. Check what your certification and insurer cover.
Should personal trainers give nutrition advice?
Yes, within the role. Clients who train ask about food anyway, and general advice on eating for a training goal helps them get more out of the program. Refer anything that depends on a health condition.
Can a personal trainer write a meal plan?
For a healthy adult, a meal plan that supports a training goal is within the role of many trainers, depending on country and certification. Build it from food the client already eats, and refer anyone with a condition that affects their diet.
How do I calculate a client's maintenance calories?
Start with a formula such as the one in the calorie calculator. After two or three weeks of logging and regular weigh-ins, take the average intake and subtract the weight change per week times 7,700 divided by 7. That is the client's real maintenance, and the calculator on this page does it for you.
How often should I change a client's calorie target?
About every two weeks, and only when the client has logged most days and hit the target on average. Compare the weight trend with the planned pace. If they match, keep going.
Should every client count calories?
No. Many clients do better with habits or hand-size portions. Counting suits clients with a clear goal who are willing to log, and it should stop if it causes stress around food.