Your nutrition goals should center on five things: eating the right amount of calories for your body, balancing your carbohydrates, protein, and fat, getting enough fiber, staying hydrated, and limiting added sugar and sodium. The specific numbers depend on your age, sex, and how active you are, but the framework is the same for nearly everyone. Here’s what to aim for.
How Many Calories You Actually Need
Calorie needs vary more than most people realize. Adult women generally need between 1,600 and 2,400 calories per day, while adult men need between 2,000 and 3,000. The biggest factors that shift you within that range are your activity level and your age.
A sedentary 30-year-old woman needs roughly 1,800 calories a day. If she’s moderately active (walking briskly for 30 to 60 minutes daily, plus regular daily movement), that jumps to about 2,000. A very active routine pushes it to 2,400. For a 30-year-old man, those same activity levels correspond to roughly 2,400, 2,600, and 3,000 calories respectively.
After about age 40, calorie needs start dropping. A sedentary man at 50 needs around 2,200 calories compared to 2,400 at 30. A sedentary woman at 50 needs about 1,600, down from 1,800 at 30. This decline continues gradually into your 60s and 70s, which is why many people notice weight creeping up in middle age even though their eating habits haven’t changed. Your body simply burns less fuel at rest as you age.
Balancing Carbs, Protein, and Fat
The three macronutrients each have a healthy target range as a percentage of your total calories. For most adults, carbohydrates should make up 55 to 70 percent of daily energy, fat should account for 15 to 25 percent, and protein should fill in the remaining 7 to 20 percent. These ranges give you plenty of flexibility to match your preferences and lifestyle.
In practical terms, on a 2,000-calorie diet, the midpoint of those ranges looks like about 1,200 calories from carbs (300 grams), 400 calories from fat (roughly 44 grams), and 400 calories from protein (100 grams). You don’t need to hit those numbers precisely every day. The goal is a general pattern over time.
Your Protein Target by Body Weight
Protein deserves its own goal because the right amount depends on what you do with your body, not just your calorie intake. The baseline recommendation for a sedentary adult is 0.8 grams of protein per kilogram of body weight per day. For a 150-pound (68 kg) person, that’s about 54 grams.
If you exercise regularly, your needs increase to about 1.1 to 1.5 grams per kilogram. And if you lift weights or train for endurance events like running or cycling, aim for 1.2 to 1.7 grams per kilogram. For that same 150-pound person, the higher end of training needs works out to around 116 grams of protein daily, more than double the sedentary baseline. Spreading protein intake across meals rather than loading it into one sitting helps your body use it more efficiently.
Fiber: The Goal Most People Miss
Women should aim for 25 to 28 grams of fiber per day, and men should target 28 to 34 grams. Most Americans get about half that amount. Fiber supports digestion, helps regulate blood sugar, and feeds the beneficial bacteria in your gut.
One compelling reason to take fiber seriously: research from the American Gut Project found that people who eat 30 or more different types of plants per week have significantly more diverse gut microbiomes than those eating fewer than 10. That number sounds high, but it includes fruits, vegetables, grains, legumes, nuts, seeds, herbs, and spices. A salad with mixed greens, tomatoes, cucumbers, sunflower seeds, and chickpeas already covers five. The point isn’t to count obsessively but to add variety wherever you can.
How Much Water You Need
A reasonable daily fluid target is about 11.5 cups (2.7 liters) for women and 15.5 cups (3.7 liters) for men. That includes all fluids, not just plain water. Coffee, tea, milk, and the water content of foods (especially fruits, soups, and vegetables) all count toward the total. The old advice to drink eight glasses of water a day remains a solid starting point if tracking total fluid intake feels like too much.
You’ll need more in hot weather, during exercise, or if you’re at higher altitude. Thirst is a decent guide for healthy adults, but it becomes less reliable as you age. Pale yellow urine is a simple, practical indicator that you’re well hydrated.
Limits on Sugar and Sodium
The most recent Dietary Guidelines for Americans, released in 2025, take a firm stance: no amount of added sugar is considered part of a healthy diet. That’s a step further than the previous guideline, which capped added sugars at 10 percent of daily calories (about 50 grams, or 12 teaspoons, on a 2,000-calorie diet). In practice, reducing added sugar as much as you reasonably can is the goal. Naturally occurring sugars in whole fruit, plain dairy, and similar foods are a different story and don’t need the same limits.
For sodium, the target is less than 2,300 milligrams per day, which is about one teaspoon of table salt. Most of the sodium in a typical diet comes from packaged and restaurant foods, not from the salt shaker at home. Checking nutrition labels for sodium content is one of the most effective things you can do. Diets higher in sodium are strongly linked to high blood pressure, stroke, and heart disease.
What About the Type of Fat?
Not all fats affect your body the same way. Saturated fat, the kind found in butter, red meat, cheese, and coconut oil, should stay at 10 percent or less of your total daily calories. On a 2,000-calorie diet, that’s about 22 grams. The rest of your fat intake should come from unsaturated sources: olive oil, avocados, nuts, seeds, and fatty fish. These fats support heart health rather than working against it.
A simple way to shift the balance is to swap your cooking fat. Using olive oil instead of butter in most cooking immediately changes the ratio without requiring you to track anything.
Setting a Weight Management Goal
If weight loss is part of your nutrition goals, the standard approach is a daily deficit of about 500 calories below what your body needs to maintain its current weight. That typically produces a loss of half a pound to one pound per week. The rate varies depending on your starting weight, sex, and activity level, but half a pound to one pound weekly is widely considered safe and sustainable.
A common mistake is cutting too aggressively. Very low-calorie diets (well below 1,200 for women or 1,500 for men) make it difficult to get adequate nutrients, tend to slow your metabolism, and are hard to maintain. A moderate deficit lets you lose fat while still eating enough to fuel your daily life and keep energy levels steady. If your goal is to gain weight or build muscle, adding 250 to 500 calories above maintenance, with an emphasis on protein, is a reasonable starting range.
Putting It All Together
Your core nutrition goals as numbers: eat the calorie level that matches your age, sex, and activity. Get 0.8 to 1.7 grams of protein per kilogram of body weight depending on how active you are. Fill 55 to 70 percent of your calories with carbohydrates, favoring whole grains, fruits, and vegetables. Keep fat to 15 to 25 percent of calories, with saturated fat under 10 percent. Aim for 25 to 34 grams of fiber daily. Drink roughly 8 to 15 cups of fluid. Minimize added sugar and keep sodium under 2,300 milligrams.
You don’t need to track all of these simultaneously. Pick the one or two goals that feel most relevant to where you are right now. If you’re eating mostly packaged foods, starting with sodium and added sugar awareness will move the needle. If you feel low on energy, check whether your calories and protein are adequate. If digestion is an issue, fiber and plant variety are likely your best levers. Small, targeted changes tend to stick better than overhauling everything at once.