Pasta and pizza sauce: the salt is in the jar

Pasta has one piece of strong evidence behind it, and the effect is small. A meta-analysis of 32 trial comparisons in 2,448 adults found that pasta eaten within a low glycemic index diet cut body weight by 1.4 lb (95% CI 0.93 to 1.9; metric: 0.63 kg, 0.42 to 0.84) against higher glycemic index diets, in trials lasting at least 3 weeks. No trial in it tested pasta alone, and the sauce was never assessed. The EU refused the claim that the carbohydrates in pasta give a low and slow blood sugar response. That refusal means the evidence fell short when it was assessed, which is different from pasta having a high glycemic index. For the sauce, the number that matters is salt. US survey data put a 260 g cup of spaghetti sauce at about 1,089 mg sodium, recalculated from the per 3.5 oz (100 g) value, against 78 mg for the reduced-sodium version. Neither the US nor the UK tables hold a separate entry for pizza sauce, so the two sauces cannot be compared directly from the data we have.

How much is actually in it

• UK composition data give tomato-based napoletana pasta sauce 65 calories, 3.8 g fat, 6.3 g sugars and 290 mg sodium per 3.5 oz (100 g). — — Evidence E source
  Per 100 g: 65 calories, fat 3.8 g, carbohydrate 6.5 g, total sugars 6.3 g, protein 1.5 g, sodium 290 mg

What a real portion looks like

• US survey data put a cup (260 g) of spaghetti sauce at about 1,089 mg sodium, against 78 mg for the reduced-sodium version. — — Evidence E source
  Sodium 419 mg per 100 g (1 cup 260 g 1089.4 mg); reduced sodium 30 mg per 100 g (1 cup 78.0 mg); usual serving 2.3 oz (65 g) 272.4 mg

What your body absorbs

• In a randomized crossover study in 10 adults, adding 500 mg of calcium to a tomato paste meal cut lycopene absorption by 83%. — 10 healthy adults, test meal with 19 mg lycopene from tomato paste, plasma followed 7 h (n = 10) Evidence B source
  Lycopene bioavailability diminished by 83% with 500 mg calcium carbonate
• In a randomized trial in men awaiting prostatectomy, 5-7 oz (142-198 g) of tomato sauce a day raised plasma lycopene by 71%, from 0.48 to 0.82 umol/l. — 33 men scheduled for prostatectomy, tomato soup, sauce or juice providing 25-35 mg lycopene per day (n = 33) Evidence B source
  Plasma lycopene 0.48 to 0.82 umol/l (+71%) on sauce

What cooking and storage change

• In a randomized crossover trial in 40 healthy adults, tomato sauce cooked with olive oil changed plasma IL-6, VCAM-1 and two immune-cell markers significantly more than raw tomato or plain sauce at 6 hours. — 40 healthy subjects, single dose on four separate days, measured 6 h after (n = 40) Evidence B source
  IL-6, VCAM-1, LFA-1 and CD36 changes significantly greater after sauce with olive oil than raw tomato or plain sauce; size not given in abstract

What it does to your health

• A meta-analysis of 32 trial comparisons in 2,448 adults found pasta within low-GI diets reduced body weight by 1.4 lb (0.63 kg) versus higher-GI diets, with no trial testing pasta alone. — 2,448 adults in randomized trials of at least 3 weeks (n = 2448) Evidence A source
  Body weight MD -1.4 lb (95% CI -1.9 to -0.93; metric: -0.63 kg, -0.84 to -0.42); BMI MD -0.26 kg/m2 (-0.36 to -0.16)

What people believe that the data does not support

• The EU refused to authorize the claim that carbohydrates in pasta give a low and slow blood sugar response. — — Evidence E source
  Status: non-authorized

The bottom line

Cooked tomato is where the rest of the evidence sits. In a randomized trial in 33 men awaiting prostate surgery, 5 to 7 oz (142 to 198 g) of tomato sauce a day raised plasma lycopene by 71 percent. That shows the pigment is absorbed from sauce. It says nothing about cancer risk, and the groups were small and followed only until the operation. In 40 healthy adults given a single dose, tomato sauce cooked with olive oil moved several inflammation markers in the blood more than raw tomato or plain sauce did 6 hours later. The abstract gives no size for that change and the design was open, so treat it as a lead. Calcium may work against lycopene. In 10 adults, 500 mg of calcium carbonate added to a tomato paste meal cut lycopene absorption by 83 percent over one meal. That was a supplement, and whether cheese on a pizza does the same has not been tested. UK composition data list a tomato napoletana pasta sauce at 65 calories, 6.3 g sugars and 290 mg sodium per 3.5 oz (100 g), from a single record. We have no card on allergy, pregnancy, children or medicines for either sauce, so this page has no safety section. If you watch your salt, the reduced-sodium jar is the one change these numbers support directly.

Sources

1. ppsc-daily-r2-05 · reference dataset
   CoFID 2021 17-619 Sauce, pasta, tomato based, napoletana: Energy 65 kcal, Fat 3.8 g, Carbohydrate 6.5 g, Total sugars 6.3 g, Protein 1.5 g, Sodium 290 mg per 100 g
   CoFID 2021, Public Health England, OGL v3.0, code 17-619 · checked 2026-09-29
2. ppsc-daily-r2-06 · reference dataset
   FNDDS Spaghetti sauce (fdc 2709745): Sodium 419 mg per 100 g; 1 cup 260 g 1089.4 mg; Quantity not specified 65 g 272.4 mg; Spaghetti sauce, reduced sodium (fdc 2709747): Sodium 30 mg per 100 g; 1 cup 260 g 78.0 mg
   USDA FNDDS 2021-2023, fdc 2709745 and 2709747 · checked 2026-09-29
3. ppsc-daily-r2-01 · randomized crossover trial
   LYC bioavailability was diminished by 83 % following the addition of Ca in the test meal.
   Br J Nutr, 2016 · checked 2026-09-29
4. ppsc-daily-r2-02 · randomized controlled trial
   Tomato soup, sauce and juice consumption significantly increased plasma lycopene concentration from 0·68 (sem 0·1) to 1·13 (sem 0·09) μmol/l (66 %), 0·48 (sem 0·09) to 0·82 (sem 0·12) μmol/l (71 %) and 0·49 (sem 0·12) to 0·78 (sem 0·1) μmol/l (59 %), respectively
   Br J Nutr, 2015 · checked 2026-09-29
5. ppsc-daily-r2-03 · randomized crossover trial
   However, the changes of plasma IL-6 and vascular cell adhesion molecule-1 (VCAM-1), and lymphocyte function-associated antigen-1 (LFA-1) from T-lymphocytes and CD36 from monocytes were significantly greater after TSOO than after RT and TS interventions.
   Nutrients, 2016 · checked 2026-09-29
6. ppsc-daily-r2-04 · meta-analysis of RCTs
   Pasta in the context of low-GI dietary patterns significantly reduced body weight (MD=-0.63 kg; 95% CI -0.84 to -0.42 kg) and BMI (MD=-0.26 kg/m2; 95% CI -0.36 to -0.16 kg/m2) compared with higher-GI dietary patterns.
   BMJ Open, 2018 · checked 2026-09-29
7. ppsc-daily-r2-07 · EU health claim register
   POL-HC-6873 Carbohydrates in pasta products Kolhydrater i pasta ger ett lågt och långsamt blodsockersvar/har ett lågt glykemiskt index (GI). Carbohydrates in pasta products provide a low and slow blood sugar response/have a low glycaemic index (GI). Non-authorised
   EU Register on nutrition and health claims, claim POL-HC-6873, snapshot 2026-09-21 · checked 2026-09-29