Större risk för viktuppgång efter diet med lågfettkost

[King Grub]

BACKGROUND:

The major circulating metabolic fuels regulate hunger, and each is affected by dietary composition. An integrated measure of postprandial energy availability from circulating metabolic fuels may help inform dietary recommendations for weight maintenance after weight loss.

AIM:

We examined the effect of low-fat (LF, 60% of energy from carbohydrate, 20% fat, 20% protein), low-glycemic index (LGI, 40%-40%-20%), and very low-carbohydrate (VLC, 10%-60%-30%) diets on total postprandial metabolic fuel energy availability (EA) during weight loss maintenance.

METHODS:

Eight obese young adults were fed a standard hypocaloric diet to produce 10-15% weight loss. They were then provided isocaloric LF, LGI, and VLC diets in a randomized crossover design, each for a 4-week period of weight loss maintenance. At the end of each dietary period, a test meal representing the respective diet was provided, and blood samples were obtained every 30 minutes for 5 hours. The primary outcome was EA, defined as the combined energy density (circulating level × relative energy content) of glucose, free fatty acids, and β-hydroxybutyrate. Secondary outcomes were individual metabolic fuels, metabolic rate, insulin, glucagon, cortisol, epinephrine, and hunger ratings. Respiratory quotient was a process measure. Data were analyzed by repeated-measures analysis of variance, with outcomes compared in the early (30 to 150 min) and late (180 to 300 min) postprandial periods.

RESULTS:

EA did not differ between the test meals during the early postprandial period (p = 0.99). However, EA in the late postprandial period was significantly lower after the LF test meal than the LGI (p<0.0001) and VLC (p<0.0001) test meals. Metabolic rate also differed in the late postprandial period (p = 0.0074), with higher values on the VLC than LF (p = 0.0064) and LGI (p = 0.0066) diets.

CONCLUSION:

These findings suggest that an LF diet may adversely affect postprandial EA and risk for weight regain during weight loss maintenance.


PLoS One. 2013;8(3):e58172. Effects of diet composition on postprandial energy availability during weight loss maintenance.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3590159/

[Bryggan]

Mycket fett verkar vara bra på flera olika sätt, inte bara att underhålla normala halter steroidhormoner under deff utan nu också för att inte vara så hungrig. Jag har svårt att komma upp 1 g fett per kg/kv per dag :(, som rekommenderas i deff-guiden. Får försöka skärpa mig på riktigt.

Lite intressant från texten:
As hypothesized, the LF meal led to lower EA in the late postprandial period compared with the LGI and VLC meals. Consistent with previous studies [4], [23], [24], [25], the early postprandial period after an LF meal was characterized by a high glucose level and concomitant exaggerated insulin response. Despite the high glucose peak 30 minutes after the LF meal, EA did not differ in the early postprandial period due to suppression of FFA and BHB after this meal. In the late postprandial period, the expected reactive hypoglycemia [23], [24], [25] did not occur; differences in late postprandial EA were instead due to significantly lower levels of FFA after the LF meal as compared with the LGI and VLC meals, and lower levels of BHB after the LF meal as compared with the VLC meal. These patterns are similar to those observed with testing after a single meal, suggesting that the difference in EA is likely not due to habituation to a given dietary pattern [4].

Similarly to EA, metabolic rate did not differ after the three test meals in the early postprandial period but differed significantly in the late postprandial period, with higher metabolic rate after a VLC meal than an LF or LGI meal. This sustained high postprandial metabolic rate after the VLC meal may contribute to the findings that total energy expenditure decreases less after weight loss on a VLC diet than on an LF or LGI diet [11], with potential implications for risk of weight regain.

LF = 60% of energy from carbohydrate, 20% fat, 20% protein
LGI = 40%–40%-20%
VLC = 10%–60%-30%
EA = energy availability
FFA = free fatty acids (decreased FFA levels lead to increased food intake)
BHB = beta-hydroxybutyrate (decrease appetite)

[Armed Dingo]

Jag äter 30/40/30 PKF. Är det att anse som lågkost? Ligger på ca 75 gram fett/dag.

[Bryggan]

Jag äter 30/40/30 PKF. Är det att anse som lågkost? Ligger på ca 75 gram fett/dag.
Ser väl hyfsat opti ut. Vet inte vad du väger dock.

[maqan]

Eftersom proteinmängden skiljde sig i de olika grupperna kanske man inte ska dra allt för stora växlar av resultaten.

[Aktionspotential]

Menlös studie, proteinintag vet man sedan tidigare är en viktig del av att behålla ämnesomsättning och vikt efter viktnedgång.

[Armed Dingo]

Ser väl hyfsat opti ut. Vet inte vad du väger dock.
Härligt, hoppades på det. Ligger på 88 kg men är bara 178cm.

[Kaelel]

Har inte läst så mycket studier inom ämnet kost och macros, vad är det rekommenderade proteinintaget på ett underskott för styrketränande individer vars huvudmål är att behålla och förhoppningsvis öka lite under deffen?
Min uppfattning har den större delen av min träningskarriär varit att ju mer protein man äter ju bättre för muskeltillväxt, något jag för något år sedan läste lite om och det verkar ju vetenskapen ha sågat totalt.
Låg förr på plus 3 g protein per kroppskilo dagligen under bulk OCH deff, efter att jag läste på mig lite så sänkte jag till 2.2-2.5 per kroppskilo under bulk, idag befinner jag mig dock under deff så jag ökade till 2.6 g, är även det "onödigt" mycket?
Äter nog inte ens 35g fett om dagen nu när jag deffar på mina 76 kg, kanske borde åtgärdas:p

[Villig]

Kan det vara fett från vad som helst? Godis ? Ost?